[Xiaomi Mi 11 Ultra] iceddeath:
okay, regarding that fastboot command.

if i open the flash_all and flash_all_lock .bat files from the CN rom.

i think it's doing the flash for both ab, probably, from the commands

fastboot %* getvar product 2>&1 | findstr /r /c:"^product: *star" /c:"^product: *mars" || echo Missmatching image and device
fastboot %* getvar product 2>&1 | findstr /r /c:"^product: *star" /c:"^product: *mars" || exit /B 1

::check anti_version
if exist %~dp0images\anti_version.txt (for /f "delims==" %%a in (%~dp0images\anti_version.txt) do (set CURRENT_ANTI_VER=%%a))
if [%CURRENT_ANTI_VER%] EQU [] set CURRENT_ANTI_VER=0
for /f "tokens=2 delims=: " %%i in ('fastboot %* getvar anti 2^>^&1 ^| findstr /r /c:"anti:"') do (set version=%%i)
if [%version%] EQU [] set version=0
set anticheck="antirollback check pass"
if %version% GTR %CURRENT_ANTI_VER% set anticheck="Current device antirollback version is greater than this pakcage"
echo %anticheck% | findstr /r /c:"pass" || @echo "Antirollback check error" && exit /B 1

fastboot %* getvar crc 2>&1 | findstr /r /c:"^crc: 1" && if %errorlevel% equ 0 (
fastboot %* flash crclist %~dp0images\crclist.txt || @echo "Flash crclist error" && exit /B 1
fastboot %* flash sparsecrclist %~dp0images\sparsecrclist.txt || @echo "Flash sparsecrclist error" && exit /B 1
)
fastboot %* erase boot_ab || @echo "Erase boot_ab error" && exit /B 1
fastboot %* flash xbl_ab %~dp0images/xbl.elf || @echo "Flash xbl_ab error" && exit 1
fastboot %* flash xbl_config_ab %~dp0images/xbl_config.elf || @echo "Flash xbl_config_ab error" && exit 1
fastboot %* flash abl_ab %~dp0images/abl.elf || @echo "Flash abl_ab error" && exit 1
fastboot %* flash aop_ab %~dp0images/aop.mbn || @echo "Flash aop_ab error" && exit 1
fastboot %* flash tz_ab %~dp0images/tz.mbn || @echo "Flash tz_ab error" && exit 1
fastboot %* flash featenabler_ab %~dp0images/featenabler.mbn || @echo "Flash featenabler_ab error" && exit 1
fastboot %* flash hyp_ab %~dp0images/hypvm.mbn || @echo "Flash hyp_ab error" && exit 1
fastboot %* flash modem_ab %~dp0images/NON-HLOS.bin || @echo "Flash modem_ab error" && exit 1
fastboot %* flash bluetooth_ab %~dp0images/BTFM.bin || @echo "Flash bluetooth_ab error" && exit 1
fastboot %* flash dsp_ab %~dp0images/dspso.bin || @echo "Flash dsp_ab error" && exit 1
fastboot %* flash keymaster_ab %~dp0images/km41.mbn || @echo "Flash keymaster_ab error" && exit 1
fastboot %* flash devcfg_ab %~dp0images/devcfg.mbn || @echo "Flash devcfg_ab error" && exit 1
fastboot %* flash qupfw_ab %~dp0images/qupv3fw.elf || @echo "Flash qupfw_ab error" && exit 1
fastboot %* flash uefisecapp_ab %~dp0images/uefi_sec.mbn || @echo "Flash uefisecapp_ab error" && exit 1
fastboot %* erase imagefv_ab || @echo "Erase imagefv_ab error" && exit /B 1
fastboot %* flash imagefv_ab %~dp0images/imagefv.elf || @echo "Flash imagefv_ab error" && exit 1
fastboot %* flash shrm_ab %~dp0images/shrm.elf || @echo "Flash shrm_ab error" && exit 1
fastboot %* flash multiimgoem_ab %~dp0images/multi_image.mbn || @echo "Flash multiimgoem_ab error" && exit 1
fastboot %* flash cpucp_ab %~dp0images/cpucp.elf || @echo "Flash cpucp_ab error" && exit 1
fastboot %* flash qweslicstore_ab %~dp0images/qweslicstore.bin || @echo "Flash qweslicstore_ab error" && exit 1
fastboot %* flash logfs %~dp0images/logfs_ufs_8mb.bin || @echo "Flash logfs error" && exit 1
fastboot %* flash rescue %~dp0images/rescue.img || @echo "Flash rescue error" && exit 1
fastboot %* flash storsec %~dp0images/storsec.mbn || @echo "Flash storsec error" && exit 1
fastboot %* flash vendor_boot_ab %~dp0images/vendor_boot.img || @echo "Flash vendor_boot_ab error" && exit 1
fastboot %* flash super %~dp0images/super.img || @echo "Flash super error" && exit 1
fastboot %* flash cust %~dp0images/cust.img || @echo "Flash cust error" && exit 1
fastboot %* flash dtbo_ab %~dp0images/dtbo.img || @echo "Flash dtbo_ab error" && exit 1
fastboot %* flash vbmeta_ab %~dp0images/vbmeta.img || @echo "Flash vbmeta_ab error" && exit 1
fastboot %* flash vbmeta_system_ab %~dp0images/vbmeta_system.img || @echo "Flash vbmeta_system_ab error" && exit 1
fastboot %* erase metadata || @echo "Erase metadata error" && exit 1
fastboot %* flash metadata %~dp0images/metadata.img || @echo "Flash metadata error" && exit 1
fastboot %* erase userdata || @echo "Erase userdata error" && exit 1
fastboot %* flash userdata %~dp0images/userdata.img || @echo "Flash userdata error" && exit 1
fastboot %* flash boot_ab %~dp0images/boot.img || @echo "Flash boot_ab error" && exit 1
fastboot %* flash logo %~dp0images/logo.img || @echo "Flash logo error" && exit 1
fastboot %* set_active a || @echo "Set active a error" && exit 1
fastboot %* oem lock || @echo "Oem lock error" && exit /B 1

we can see above, flash modem_ab, bluetooth_ab, boot_ab. does that mean both slots already have the official CN rom?