[b16]

The Team Win Recovery Project (twrp) was ported to Thunderbolt but did not have ext3 support. While some roms for the Thunderbolt will mount /system as ext4, it's actually formatted as an ext3 partition and the recovery requires ext3 support for it. I have compiled a version of TWRP that supports ext3. As usual, this should work, but I make no guarantees. And of course the source is on github: https://github.com/androidrbox/Team-Win-Recovery-Project

Fastboot: http://www.mediafire.com/file/ay2qz83m06ov46b/twrp_ext3.img
Bootloader: http://www.mediafire.com/file/xi5iv8oaqn4ipp7/twrpext3_PG05IMG.zip

To flash with fastboot boot into the bootloader, run: fastboot flash recovery twrp_ext3.img
To flash with the bootloader, flash like any other PG05 image.

Forgive my ignorance, are you a regular dev? I can update your status here.