fsck.f2fs exited with status code 255
Info: MKFS version
  "Linux version 5.18.16-1rodete4-amd64 (glinux-team@google.com) (gcc-11 (Debian 11.3.0-5) 11.3.0, GNU ld (GNU Binutils for Debian) 2.39) #1 SMP PREEMPT_DYNAMIC Debian 5.18.16-1rodete4 (2022-10-21)"
Info: FSCK version
  from "Linux version 5.18.16-1rodete4-amd64 (glinux-team@google.com) (gcc-11 (Debian 11.3.0-5) 11.3.0, GNU ld (GNU Binutils for Debian) 2.39) #1 SMP PREEMPT_DYNAMIC Debian 5.18.16-1rodete4 (2022-10-21)"
    to "Linux version 5.9.0-0.bpo.5-cloud-amd64 (debian-kernel@lists.debian.org) (gcc-8 (Debian 8.3.0-6) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #1 SMP Debian 5.9.15-1~bpo10+1 (2020-12-31)"
Info: superblock features = 1 :  encrypt
Info: superblock encrypt level = 0, salt = 00000000000000000000000000000000
Info: Segments per section = 1
Info: Sections per zone = 1
Info: total FS sectors = 131072 (64 MB)
	Invalid CP CRC: offset:4092, crc:0x4c38c8ca, calc:0xe3d4b63
Info: CKPT version = 48b305e5
	Error: f2fs_init_nid_bitmap: nid(2147483648) is invalid!!!
Info: Corrupted valid nat_bits in checkpoint
Info: Write valid nat_bits in checkpoint
[ASSERT] (build_nat_area_bitmap:3290)  --> 	Error: ino[0x       0] or blk_addr[0x            3e00] is invalid

Info: checkpoint state = 1c5 :  trimmed nat_bits crc compacted_summary unmount
[ASSERT] (__chk_dentries:1636)  --> Bad dentry 0x0 with unexpected ftype 0x0
[FIX] (__chk_dentries:1639)  --> Clear bad dentry 0x0 with bad ftype 0x0
[ASSERT] (sanity_check_nid: 429)  --> nid[0x4] nat_entry->ino[0x101] footer.ino[0x0]
[FIX] (__chk_dentries:1739)  --> Unlink [0x4] - file0 len[0x5], type[0x2]
[ASSERT] (fsck_chk_inode_blk:1108)  --> ino: 0x3 i_links: 3, real links: 2
[FIX] (fsck_chk_inode_blk:1113)  --> Dir: 0x3 i_links= 0x3 -> 0x2
[ASSERT] (fsck_chk_inode_blk:1119)  --> ino: 0x3 dots: 1
[FIX] (fsck_chk_inode_blk:1124)  --> Dir: 0x3 set inline_dots

NID[0x5] is unreachable, blkaddr:0x3c00
NID[0x6] is unreachable, blkaddr:0x3c01
[FSCK] Max image size: 20 MB, Free space: 44 MB
[FSCK] Unreachable nat entries                        [Fail] [0x2]
[FSCK] SIT valid block bitmap checking                [Fail]
[FSCK] Hard link checking for regular file            [Ok..] [0x1]
[FSCK] valid_block_count matching with CP             [Fail] [0x8]
[FSCK] valid_node_count matching with CP (de lookup)  [Fail] [0x4]
[FSCK] valid_node_count matching with CP (nat lookup) [Fail] [0x6]
[FSCK] valid_inode_count matched with CP              [Fail] [0x4]
[FSCK] free segment_count matched with CP             [Ok..] [0x12]
[FSCK] next block offset is free                      [Ok..]
[FSCK] fixing SIT types
[FSCK] other corrupted bugs                           [Fail]

Do you want to restore lost files into ./lost_found/? [Y/N] [ASSERT] (fsck_verify:3345) res >= 0