Unrecognized filesystem type

[WiderstandD]

After following the README under Ubuntu 20.04.1 and using STMicroelectronics STM32MP157C-DK2 Discovery Board I get ** Unrecognized filesystem type ** and uboot shell after it. So the device does not boot in to Linux OS. I am booting from an 32Gb SD Card and I am using onboard ST-Link/UART connected to my PC for the shell output. Before flashing I formatted my SD Card using gparted, format:fat32. I also tried eFAT and ext4, same result. Do you have any ideas or suggestions?

uboot> mmc part Output:
`
Partition Map for MMC device 0 -- Partition Type: EFI

Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
1 0x00000022 0x00000221 "fsbl1"
attrs: 0x0000000000000000
type: 8da63339-0007-60c0-c436-083ac8230908
guid: 46e5e24a-f98d-4a55-8649-c429a456d7b5
2 0x00000222 0x00000421 "fsbl2"
attrs: 0x0000000000000000
type: 8da63339-0007-60c0-c436-083ac8230908
guid: 929690ad-182f-484f-8b4d-565f91ef67d4
3 0x00000422 0x00001421 "ssbl"
attrs: 0x0000000000000000
type: 8da63339-0007-60c0-c436-083ac8230908
guid: 77135b9d-72f0-45c3-9a0f-89f7d2fbe112
4 0x00001422 0x0003ffde "alpine"
attrs: 0x0000000000000000
type: 0fc63daf-8483-4772-8e79-3d69d8477de4
type: linux
guid: 4f0eb0c1-5a9e-4215-9d3d-48d3ae076eb7 `