TSSChecker is
a useful tool developed by tihmstar has been updated to fix an issues and now correctly supports iPhone 7 and iPhone 7 Plus which is a very good news for jailbreak community that allows you to save
.shsh2 blobs for Prometheus to downgrade or upgrade an iPhone, iPad and iPod
touch to an unsigned iOS firmware version like iOS 10.1, iOS 10.1.1.
Please note that saving .shsh with TinyUmbrella will not work
for Prometheus.

TSSChecker is a useful tool developed by tihmstar has been updated to fix an issues and now correctly supports iPhone 7 and iPhone 7 Plus which is a very good news for jailbreak community that allows you to save .shsh2 blobs for Prometheus

Since now
Apple is signing iOS 10.2 so you can only generate SHSH2 blobs for this
firmware only. If you had already saved iOS 10.1.x SHSH2 blobs
previously for iPhone 7 and 7 Plus using the old TSSChecker version, then they
are not valid SHSH2 bolbs as there was an issue with the device that produced
inaccurate SHSH2 blobs for iPhone 7 and iPhone 7 Plus.
If you have an
iPhone 7, iPhone 7 Plus or an older iOS devices model, I would highly recommend
to save the SHSH2 blob for iOS 10.2. Because you never know Luca Todesco might
release a stable jailbreak for iOS 10.2. as the current beta of Yalu jailbreak supports
iOS 10.1 – iOS 10.1.1. Which is not stable and contains a number of issues for
jailbreakers.
Via: tihmstar