I made it. Full conversion is ok so far.
Only Bluetooth microphone doesn't work but I didn't check in original 2757 too.

I understand risk in future that new transformed Dezl 2757 might stop eventually...

1 st method went well too but first loading maps were too long and setting a language ect. (maybe 3-5 minutes). This way I asked for clearing NV, maybe this is reason for delaying and I should restart 2 more times to see result but I didn't.

2 nd method had the same problem with first loading maps and setting language but after restart everything going well.
(By the way, I didn't clear NV before and after)

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