820-01521 5.16v 0.07a and stuck un DFU

[No-Clean]

Clean board, no history available.

Already tried 2 new CD3215 after checking that PP3V3_UPC_XA_LDO and PP3V3_G3H_RTC and PP20V_USBC_XA_VBUS_F were all present.

I tried to restore T2 with a Mac running Catalina and again on another one with Big Sur, both return and error about not being able to exit DFU mode.

PPBUS_G3H 12.3V
PP3V3_G3H 3.3V

No shorts on all other rails.

 

[2informaticos]

Did you try another cable?
I reied with charger cable, good for data, but couldn't get into DFU.
Only worked for me, with original Thunderbolt 3 cable bought from Apple store (0.8m - 45€).

 

[No-Clean]

I used the same Belkin USB-C cable that I have used to restore all other Macs so the cable is not the issue I don't think, I get some error saying that it could not transition from DFU....

 

[2informaticos]

Transition error I also got with one 01521 board.
However, that board starts normal and restarts itself as soon as progress bar appears.
It stays in recovery menu without restarting.
Probably something wrong with T2 chip...