Running T6BR won’t work as the T6BR HDD you have is a 3.5” HDD instead of 2.5” the later systems, (357A/B used 3.5” while 357C/369 used 2.5”) and the HDD format versions are different from fat PS3s and slims, meaning even if you get a SATA extension cable and plug the HDD to the 369, you will still get an error message.
These systems are use JVS, any JVS I/O should work fine…