That's too long of course and likely it was stuck on something again trying to reboot ... and now i see you removed the card and re-tried with 1651 folder name and surprisingly it's dumped the logo (16.bin), reportedly erased region 14 and re-flashed it with the O650's 14.bin (fw_all).

Not deleting gupdate.gcd isn't unexpected of course but it hasn't dumped region 154, when we previously were successful in dumping 154 when using 2512 folder! I suspect the modded boot.bin flashed as RGN to overwrite region 12 successfully and perhaps it's also re-mapped the region layout of O650, changed HWID to 1651, although maybe only partially, and that's why it was able to read the 1651 folder subsequently.

So some progress, seems it's now at least partly reconverted to O650 despite still identifying as O750.

Maybe the non-vol region for O650 is 41 and 154 doesn't exist in O650's region layout. Try to dump it using the usual SD card method with "rrgn,41,1/41.bin" and use O650's V5.60 boot.bin as Ldr.bin in 1651 folder. Also please report how it's now performing after you force it off and back on.

Please also upload the 16.bin so i can check it.

(I'll request of staff that this entire exchange of ours be moved to it's own thread because of the unusual problems with this device.)
Done. Very interesting thread.