Dell 5020 Controller Problem

Hello, I have a problem with the Dell 5020 controller. Today it rebooted itself and after that it became unavailable. I managed to connect via COM port, where I see the following events:

mmcblk0: error -5 sending status command, retrying
SQUASHFS error: Unable to read fragment cache entry [1c202a9]
SQUASHFS error: Unable to read page, block 1c202a9, size 15be3
SQUASHFS error: Unable to read fragment cache entry [1c202a9]
SQUASHFS error: Unable to read page, block 1c202a9, size 15be3
SQUASHFS error: Unable to read fragment cache entry [1c202a9]
SQUASHFS error: Unable to read page, block 1c202a9, size 15be3
SQUASHFS error: Unable to read fragment cache entry [1c202a9]
SQUASHFS error: Unable to read page, block 1c202a9, size 15be3
SQUASHFS error: Unable to read fragment cache entry [1c202a9]
SQUASHFS error: Unable to read page, block 1c202a9, size 15be3
SQUASHFS error: Unable to read fragment cache entry [1c202a9]
SQUASHFS error: Unable to read page, block 1c202a9, size 15be3

/home/root # mmcblk0: error -5 sending status command, retrying
mmcblk0: error -5 sending status command, aborting
end_request: I/O error, dev mmcblk0, sector 36925
end_request: I/O error, dev mmcblk0, sector 36927
end_request: I/O error, dev mmcblk0, sector 36929
end_request: I/O error, dev mmcblk0, sector 36931
end_request: I/O error, dev mmcblk0, sector 36933
end_request: I/O error, dev mmcblk0, sector 36935
end_request: I/O error, dev mmcblk0, sector 36937
end_request: I/O error, dev mmcblk0, sector 36939
end_request: I/O error, dev mmcblk0, sector 36941
end_request: I/O error, dev mmcblk0, sector 36943
SQUASHFS error: lzo decompression failed, data probably corrupt
SQUASHFS error: squashfs_read_data failed to read block 0x207af0
SQUASHFS error: Unable to read data cache entry [207af0]
SQUASHFS error: Unable to read page, block 207af0, size 245d
mmcblk0: error -5 sending status command, retrying
mmcblk0: error -5 sending status command, retrying