Hello
I have same mistake for new l3+ and l3++ board
Can't recover with sd card
I contact with usb to uart to control board and resualt of memory info:
"
U-Boot# mmcinfo
mmc_send_cmd : timeout: No status update
Card did not respond to voltage select!
Device: OMAP SD/MMC
Manufacturer ID: 0
OEM: 0
Name: Tran Speed: 0
Rd Block Len: 0
MMC version 0.0
High Capacity: No
Capacity: 0 Bytes
Bus Width: 1-bit
"
Pleaase help me to recover controlboard without sd card in u-Boot mode
Thanks