hello,
I bought 2 tests pcb with a SM2258XT as controller and differents supports for BGA.

- Screenshot from 2025-05-20 17-33-07.png (236.29 KiB) Viewed 545 times
I'm waiting answer from the vendor about hardware but I saw on the black card, a header pins with tdi/tdo/tck.... so I guess a jtag.
is someone already use, with success, one of these cards? did you use JTAG and if yes, it is only to communicate with controller or were you able to read a flash?
I'm free to chat about this subject !