I've received the NanoPi M4 V2 today.
I tried Armbian images for the M4 on SD and eMMC. None boot.
So I tried the RockPi4 images since that's got lpddr4 too. That works. Of course no on-board wifi since another chip.
So my guess is the lpddr4 isn't supported by the uboot for the M4.
It is a nice board. I've got the metal case with NVMe hat too. Looks all very nice. But a bit impractical if you need to acces eMMC.
V2 buster image, kernel 5.4 from an NVMe drive. It works mostly fine but I've been having a consistent issue with copying directories with large files from a USB 3 drive to the internal NVMe. After `cp -r` the green LED of the board stops flashing and it reboots by itself. Unfortunately I can't get logs after the reboot so I don't know how to post more info about this.
I never had this issue with the original board with the same USB3 ASM1051E SATA 6Gb/s brid