Basically the detaching of the PCB from the disk is a "trick" to exit a "loop" in which the firmware may go (and it is needed for the BSY fix, NOT for the LBA0 one)
As well, on a fully operational disk there should be no need to detach it, but still, it should work also completely detached.
But always, and particularly with the detached board, GROUNDing is essential, that's why I asked (and you completely failed to reply
If you recheck the LBA0 fix ONLY you will se how the detaching is not needed at all, as well as the N1, etc., the LBA0 is simply (and ONLY):
F3 T>m0,2,2,0,0,0,0,22 (enter)
(but when you do so you get DiagError 0000500D, right?)
The only thing that you can try is to try executing the command at a different level, i.e. you could try going to level 3 and then issue the m0,2,2,0,0,0,0,22 command
(but the issue there was a BSY).