[SOLVED] Help! PSC7700 bricked: turns off after 30 seconds

[juusso]

toggle should sswitch you to alternative firmware (if exists!).

You missed cmac for changed exe.img don't change any ro partition, it are being watched by authuld!

[juusso]

Yes, here is alternative fw on your tv. You can write toggle without any argument.

[juusso]

For the future: if you modify any ro partition, you have to recalculate hashes and write it to right cmac partitions.
Check this topic and posts by mirsev and Denny. Tools can calculate hashes for BD players and TV`s, but different mkey is needed, are attached.