This isn't a single, official download. Instead, it's a descriptive tag used by enthusiasts to identify a specific type of software collection. Here’s what each part likely represents:
Windows 10 Pro 21H1 (Build 19043), also known as the May 2021 Update
: Allows instantaneous terminal commands without setting up manual environment variables.
To understand what is, it helps to break down the long, keyword-dense title into its individual technical elements:
(the May 2021 Update), was primarily a scoped release focused on security and remote work enhancements, the "GSM Pack" transforms it into a niche toolkit for hardware and software technicians. Core Foundation: Windows 10 21H1 Pro windows+10+pro+21h1+gsm+pack+v27+2021
Windows 10 Pro version 21H1, along with specific configurations like the GSM Pack and version updates such as v27 from 2021, demonstrates the ongoing effort by Microsoft to refine and enhance the Windows experience. For professionals and businesses, staying updated with the latest features, security patches, and performance improvements is crucial. As technology continues to evolve, the adaptability and functionality of Windows 10 Pro make it a robust choice for a wide range of computing needs.
A taskbar widget that provides quick access to weather, news, and personalized information. IT tools to support Windows 10, version 21H1
: Utilize tools like Rufus to burn the custom ISO image cleanly onto a high-speed USB drive for installation.
: Created primarily for mobile repair technicians who need a fast, bloatware-free OS to run flashing tools (like Miracle Box, UMT, or Z3X) and mobile drivers without system interference. Version History This isn't a single, official download
: Microsoft officially terminated support for Windows 10 on October 14, 2025 . Operating a 21H1 base means the system lacks critical security patches for modern vulnerabilities.
Scenarios where a slimmed-down, stable, and pre-configured image is needed for deployment in remote or offline locations. Key Features of Windows 10 Pro 21H1 in this Pack
: Allows users to set an external camera as the default for Windows Hello facial recognition when both internal and external cameras are present.
: Enhanced the performance of the Windows Management Instrumentation (WMI) Group Policy Service to better support remote work scenarios. News and Interests To understand what is, it helps to break
USB drivers for Mediatek (MTK), Qualcomm, and Samsung devices.
The digital landscape is frequently populated by official software releases from giants like Microsoft, but a parallel world of custom-modified operating systems exists to serve niche communities. One such example is the , a 2021 release designed specifically for mobile technicians and "GSM" (Global System for Mobile Communications) experts. These builds represent a departure from the standard "one-size-fits-all" approach, aiming instead for extreme efficiency and pre-configured utility. The Purpose of Custom "GSM" Packs
The keyword refers to a highly specialized, unofficial custom operating system build tailored for mobile hardware technicians, device flashers, and software repair engineers. Released during the Microsoft Windows 10 21H1 lifecycle in 2021, this customized "GSM Pack" (Version 27) modifies the standard Windows environment to eliminate driver conflicts, bypass signature enforcement, and streamline smartphone unlocking and flashing procedures.
testssl.sh is free and open source software. You can use it under the terms of GPLv2, please review the License before using it.
Development takes place at github. We're now @ 3.2.3 (stable) and 3.3dev.
There was a last release of 3.0.10 (oldstable) but that was the last one in the 3.0.x branch.
Supported will always be the current dev version and the version before (n-1 rule). As soon as the dev version becomes the stable release, this will be the n-1 version and receives bugfixes only. The dev version has historically not delivered really broken software (no facebook paradigm). Consider it like a rolling release: It'll definitely change-- that is the point of development-- things might break for you if you e.g. expect the output or features all to be the same. But other than that: The dev version itself won't break (TM).
3.2 is the stable branch. There was one final 3.0.10 release, a.k.a the old stable. If you need longer support for 3.0.x there's a possibility for paid maintenance support. We are focussing on 3.3dev, further development will take place in that branch. We aim to not break things badly but, as said, things will change. If you want to make use of new features like QUIC, TLS 1.3 0-RTT, newer SSLlabs rating, check for the Opossum vulnerability and more, you should consider this branch.
-testssl.sh is pretty much portable/compatible. It is working on every Linux, Mac OS X, FreeBSD distribution, on MSYS2/Cygwin (slow).
It is supposed also to work on any other unixoid systems.
A newer OpenSSL version (1.0) is recommended though. /bin/bash is a prerequisite –
otherwise there would be no sockets.
openssl <verify|ocsp|pkey> . In principle any OpenSSL or even LibreSSL can be used as a helper. It's recommended to
use the one supplied as it makes sure special tests or features like IPv6, proxy support, STARTTLS MySQL or PostgreSQL are supported. (The one supplied stems
originally from github.com/PeterMosmans/openssl. openssl-1.0.2k-chacha.pm.ipv6.Linux+FreeBSD.tar.gz is a Linux- and FreeBSD-only tarball. The directory openssl-1.0.2i-chacha.pm.ipv6.contributed/ contains contributed builds for ARM7l and Darwin binaries).
curl -L https://testssl.sh or wget -O - https://testssl.sh pulls the current stable code from here curl -L https://testssl.sh/dev/ or wget -O - https://testssl.sh/dev/ pulls the current development code from githubuserid@somehost:~ % testssl.sh
"testssl.sh [options] <URI>" or "testssl.sh <options>"
"testssl.sh <options>", where <options> is:
--help what you're looking at
-b, --banner displays banner + version of testssl.sh
-v, --version same as previous
-V, --local pretty print all local ciphers
-V, --local <pattern> which local ciphers with <pattern> are available? If pattern is not a number: word match
<pattern> is always an ignore case word pattern of cipher hexcode or any other string in the name, kx or bits
"testssl.sh <URI>", where <URI> is:
<URI> host|host:port|URL|URL:port port 443 is default, URL can only contain HTTPS protocol)
"testssl.sh [options] <URI>", where [options] is:
-t, --starttls <protocol> Does a default run against a STARTTLS enabled <protocol,
protocol is <ftp|smtp|lmtp|pop3|imap|xmpp|telnet|ldap|nntp|postgres|mysql>
--xmpphost <to_domain> For STARTTLS enabled XMPP it supplies the XML stream to-'' domain -- sometimes needed
--mx <domain/host> Tests MX records from high to low priority (STARTTLS, port 25)
--file/-iL <fname> Mass testing option: Reads one testssl.sh command line per line from <fname>.
Can be combined with --serial or --parallel. Implicitly turns on "--warnings batch".
Text format 1: Comments via # allowed, EOF signals end of <fname>
Text format 2: nmap output in greppable format (-oG), 1 port per line allowed
--mode <serial|parallel> Mass testing to be done serial (default) or parallel (--parallel is shortcut for the latter)
--warnings <batch|off> "batch" doesn't continue when a testing error is encountered, off continues and skips warnings
--connect-timeout <seconds> useful to avoid hangers. Max <seconds> to wait for the TCP socket connect to return
--openssl-timeout <seconds> useful to avoid hangers. Max <seconds> to wait before openssl connect will be terminated
single check as <options> ("testssl.sh URI" does everything except -E and -g):
-e, --each-cipher checks each local cipher remotely
-E, --cipher-per-proto checks those per protocol
-s, --std, --standard tests certain lists of cipher suites by strength
-p, --protocols checks TLS/SSL protocols (including SPDY/HTTP2)
-g, --grease tests several server implementation bugs like GREASE and size limitations
-S, --server-defaults displays the server's default picks and certificate info
-P, --server-preference displays the server's picks: protocol+cipher
-x, --single-cipher <pattern> tests matched <pattern> of ciphers
(if <pattern> not a number: word match)
-c, --client-simulation test client simulations, see which client negotiates with cipher and protocol
-h, --header, --headers tests HSTS, HPKP, server/app banner, security headers, cookie, reverse proxy, IPv4 address
-U, --vulnerable tests all (of the following) vulnerabilities (if applicable)
-H, --heartbleed tests for Heartbleed vulnerability
-I, --ccs, --ccs-injection tests for CCS injection vulnerability
-T, --ticketbleed tests for Ticketbleed vulnerability in BigIP loadbalancers
-BB, --robot tests for Return of Bleichenbacher's Oracle Threat (ROBOT) vulnerability
-R, --renegotiation tests for renegotiation vulnerabilities
-C, --compression, --crime tests for CRIME vulnerability (TLS compression issue)
-B, --breach tests for BREACH vulnerability (HTTP compression issue)
-O, --poodle tests for POODLE (SSL) vulnerability
-Z, --tls-fallback checks TLS_FALLBACK_SCSV mitigation
-W, --sweet32 tests 64 bit block ciphers (3DES, RC2 and IDEA): SWEET32 vulnerability
-A, --beast tests for BEAST vulnerability
-L, --lucky13 tests for LUCKY13
-F, --freak tests for FREAK vulnerability
-J, --logjam tests for LOGJAM vulnerability
-D, --drown tests for DROWN vulnerability
-f, --pfs, --fs, --nsa checks (perfect) forward secrecy settings
-4, --rc4, --appelbaum which RC4 ciphers are being offered?
tuning / connect options (most also can be preset via environment variables):
--fast omits some checks: using openssl for all ciphers (-e), show only first preferred cipher.
-9, --full includes tests for implementation bugs and cipher per protocol (could disappear)
--bugs enables the "-bugs" option of s_client, needed e.g. for some buggy F5s
--assume-http if protocol check fails it assumes HTTP protocol and enforces HTTP checks
--ssl-native fallback to checks with OpenSSL where sockets are normally used
--openssl <PATH> use this openssl binary (default: look in $PATH, $RUN_DIR of testssl.sh)
--proxy <host:port|auto> (experimental) proxy connects via <host:port>, auto: values from $env ($http(s)_proxy)
-6 also use IPv6. Works only with supporting OpenSSL version and IPv6 connectivity
--ip <ip> a) tests the supplied <ip> v4 or v6 address instead of resolving host(s) in URI
b) arg "one" means: just test the first DNS returns (useful for multiple IPs)
-n, --nodns <min|none> if "none": do not try any DNS lookups, "min" queries A, AAAA and MX records
--sneaky leave less traces in target logs: user agent, referer
--ids-friendly skips a few vulnerability checks which may cause IDSs to block the scanning IP
--phone-out allow to contact external servers for CRL download and querying OCSP responder
--add-ca <cafile> path to <cafile> or a comma separated list of CA files enables test against additional CAs.
--basicauth <user:pass> provide HTTP basic auth information.
output options (can also be preset via environment variables):
--quiet don't output the banner. By doing this you acknowledge usage terms normally appearing in the banner
--wide wide output for tests like RC4, BEAST. PFS also with hexcode, kx, strength, RFC name
--show-each for wide outputs: display all ciphers tested -- not only succeeded ones
--mapping <openssl| openssl: use the OpenSSL cipher suite name as the primary name cipher suite name form (default)
iana|rfc -> use the IANA/(RFC) cipher suite name as the primary name cipher suite name form
no-openssl| -> don't display the OpenSSL cipher suite name, display IANA/(RFC) names only
no-iana|no-rfc> -> don't display the IANA/(RFC) cipher suite name, display OpenSSL names only
--color <0|1|2|3> 0: no escape or other codes, 1: b/w escape codes, 2: color (default), 3: extra color (color all ciphers)
--colorblind swap green and blue in the output
--debug <0-6> 1: screen output normal but keeps debug output in /tmp/. 2-6: see "grep -A 5 '^DEBUG=' testssl.sh"
file output options (can also be preset via environment variables)
--log, --logging logs stdout to '${NODE}-p${port}${YYYYMMDD-HHMM}.log' in current working directory (cwd)
--logfile|-oL <logfile> logs stdout to 'dir/${NODE}-p${port}${YYYYMMDD-HHMM}.log'. If 'logfile' is a dir or to a specified 'logfile'
--json additional output of findings to flat JSON file '${NODE}-p${port}${YYYYMMDD-HHMM}.json' in cwd
--jsonfile|-oj <jsonfile> additional output to the specified flat JSON file or directory, similar to --logfile
--json-pretty additional JSON structured output of findings to a file '${NODE}-p${port}${YYYYMMDD-HHMM}.json' in cwd
--jsonfile-pretty|-oJ <jsonfile> additional JSON structured output to the specified file or directory, similar to --logfile
--csv additional output of findings to CSV file '${NODE}-p${port}${YYYYMMDD-HHMM}.csv' in cwd or directory
--csvfile|-oC <csvfile> additional output as CSV to the specified file or directory, similar to --logfile
--html additional output as HTML to file '${NODE}-p${port}${YYYYMMDD-HHMM}.html'
--htmlfile|-oH <htmlfile> additional output as HTML to the specified file or directory, similar to --logfile
--out(f,F)ile|-oa/-oA <fname> log to a LOG,JSON,CSV,HTML file (see nmap). -oA/-oa: pretty/flat JSON.
"auto" uses '${NODE}-p${port}${YYYYMMDD-HHMM}'. If fname if a dir uses 'dir/${NODE}-p${port}${YYYYMMDD-HHMM}'
--hints additional hints to findings
--severity <severity> severities with lower level will be filtered for CSV+JSON, possible values <LOW|MEDIUM|HIGH|CRITICAL>
--append if (non-empty) <logfile>, <csvfile>, <jsonfile> or <htmlfile> exists, append to file. Omits any header
--outprefix <fname_prefix> before '${NODE}.' above prepend <fname_prefix>
Options requiring a value can also be called with '=' e.g. testssl.sh -t=smtp --wide --openssl=/usr/bin/openssl <URI>.
<URI> always needs to be the last parameter.
userid@somehost:~ %
testssl.sh --starttls smtp <smtphost>.<tld>:587 testssl.sh --starttls ftp <ftphost>.<tld>:21 testssl.sh -t xmpp <jabberhost>.<tld>:5222 testssl.sh -t xmpp --xmpphost <XMPP domain> <jabberhost>.<tld>:5222 testssl.sh --starttls imap <imaphost>.<tld>:143The ports in those examples above are just the standard ports. Also here you're free to check any port. //refactor those, see e.g. https://content-security-policy.com/unsafe-hashes/ or just drop tis shit
3.2
3.0