[OnePlus 9RT] strelokcyka:
hmm. Oneplus 9RT mt2111 here, coming from A12.1 c.07

No success with this install, Using your instructions I get:

Info: Disable heap-based policy
Info: Debug level = 1
Info: Trim is disabled
Info: Set conf for android
Info: Segments per section = 1
Info: Sections per zone = 1
Info: sector size = 512
Info: total sectors = 470920600 (229941 MB)
Info: zone aligned segment0 blkaddr: 512
Info: add quota type = 0 => 4
Info: add quota type = 1 => 5
[f2fs_init_sit_area: 626] Filling sit area at offset 0x00600000
[f2fs_init_nat_area: 660] Filling nat area at offset 0x01a00000
[f2fs_write_root_inode:1274] Writing root inode (hot node), 2b800 0 200 at offset 0x00178176
[f2fs_write_default_quota:1350] Writing quota data, at offset 0002be01, 0002be02
[f2fs_write_qf_inode:1407] Writing quota inode (hot node), 2b800 0 200 at offset 0x00178177
[f2fs_write_default_quota:1350] Writing quota data, at offset 0002be03, 0002be04
[f2fs_write_qf_inode:1407] Writing quota inode (hot node), 2b800 0 200 at offset 0x00178178
[f2fs_update_nat_root:1461] Writing nat root, at offset 0x00001a00
[f2fs_add_default_dentry_root:1658] Writing default dentry root, at offset 0x0002be00
Info: Overprovision ratio = 0.420%
Info: Overprovision segments = 963 (GC reserved = 484)
[f2fs_write_check_point_pack: 819] Writing main segments, cp at offset 0x00000200
[f2fs_write_check_point_pack: 975] Writing Segment summary for HOT/WARM/COLD_DATA, at offset 0x00000201
[f2fs_write_check_point_pack:1002] Writing Segment summary for HOT_NODE, at offset 0x00000202
[f2fs_write_check_point_pack:1014] Writing Segment summary for WARM_NODE, at offset 0x00000203
[f2fs_write_check_point_pack:1025] Writing Segment summary for COLD_NODE, at offset 0x00000204
[f2fs_write_check_point_pack:1033] Writing cp page2, at offset 0x00000205
[f2fs_write_check_point_pack:1053] Writing NAT bits pages, at offset 0x000003fe
[f2fs_write_check_point_pack:1074] Writing cp page 1 of checkpoint pack 2, at offset 0x00000400
[f2fs_write_check_point_pack:1093] Writing cp page 2 of checkpoint pack 2, at offset 0x00000405
[f2fs_write_super_block:1126] Writing super block, at offset 0x00000000
Info: format successful
Sending 'userdata' (85 KB) OKAY [ 0.005s]
Writing 'userdata' OKAY [ 0.013s]
Erasing 'metadata' OKAY [ 4.919s]
mke2fs 1.46.2 (28-Feb-2021)
Creating filesystem with 4096 4k blocks and 4096 inodes

Allocating group tables: done
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done

Sending 'metadata' (44 KB) OKAY [ 0.003s]
Writing 'metadata' OKAY [ 0.006s]
Finished. Total time: 6.010s

C:\platform-tools\platform-tools>fastboot update RiceDroid-userdebug-031022.inferno0230.zip
--------------------------------------------
Bootloader Version...:
Baseband Version.....:
Serial Number........: 25551e57
--------------------------------------------
extracting android-info.txt (0 MB) to RAM...
Checking 'product' OKAY [ 0.004s]
Setting current slot to 'b' OKAY [ 0.009s]
extracting boot.img (192 MB) to disk... took 0.344s
archive does not contain 'boot.sig'
Sending 'boot_b' (196608 KB) OKAY [ 4.961s]
Writing 'boot_b' OKAY [ 0.408s]
archive does not contain 'init_boot.img'
extracting dtbo.img (24 MB) to disk... took 0.032s
archive does not contain 'dtbo.sig'
Sending 'dtbo' (24576 KB) OKAY [ 0.621s]
Writing 'dtbo' OKAY [ 0.028s]
archive does not contain 'dt.img'
archive does not contain 'pvmfw.img'
archive does not contain 'recovery.img'
extracting vbmeta.img (0 MB) to disk... took 0.000s
archive does not contain 'vbmeta.sig'
Sending 'vbmeta' (8 KB) OKAY [ 0.001s]
Writing 'vbmeta' OKAY [ 0.001s]
extracting vbmeta_system.img (0 MB) to disk... took 0.001s
archive does not contain 'vbmeta_system.sig'
Sending 'vbmeta_system' (4 KB) OKAY [ 0.001s]
Writing 'vbmeta_system' OKAY [ 0.001s]
extracting vbmeta_vendor.img (0 MB) to disk... took 0.001s
archive does not contain 'vbmeta_vendor.sig'
Sending 'vbmeta_vendor' (4 KB) OKAY [ 0.001s]
Writing 'vbmeta_vendor' OKAY [ 0.001s]
extracting vendor_boot.img (192 MB) to disk... took 0.247s
archive does not contain 'vendor_boot.sig'
Sending 'vendor_boot' (196608 KB) OKAY [ 4.963s]
Writing 'vendor_boot' OKAY [ 0.375s]
extracting super_empty.img (0 MB) to disk... took 0.000s
Rebooting into fastboot OKAY [ 0.001s]
< waiting for any device >

And then it returns to AOSP recovery, I tried two types of platform tools v32 and above, no success

edit: to those that hit this error like me and want to recover, use the ColorOS to OxyOS A.07+ fastboot migration firmware on the other thread, and use install.bat/sh in bootloader fastboot

(if that doesn't work make sure you switch to slot b - this is what I had to do trying to figure that out blind - either use fastbootenhance or the boota/b switch commands to get to alternate boot partition)