In the meantime, here’s what I can tell you from known information about (which is a popular tool for reading/writing eMMC and OneNAND via JTAG or direct eMMC connection):
A Samsung A12 (SM-A125F) is hard-bricked after a failed OTA update. No download mode, no recovery, no life. easy jtag plus emmc tool ver2030 top
| Limitation | Note | |------------|------| | | Cannot decrypt user data if device uses FBE (File-Based Encryption) or FDE (Full Disk Encryption) without keys. | | RPMB Access | Can read/write RPMB only if authentication key is known (rare outside manufacturer). | | Soldering Required | ISP connection requires micro-soldering skills (fine wires to eMMC pads). | | Software Cost | Full software license may be paid (some clones work only with older versions). | | Clone Hardware Risk | Many counterfeit “Easy JTAG Plus” boxes exist; ver 2030 Top should be purchased from official/trusted sources. | In the meantime, here’s what I can tell