[Xiaomi Poco X3 NFC Questions & Answers] BjornBear:
Thanks everyone for your help so far. I was considering paying for an EDL flash service (someone I know had theirs done successfully through an account on Telegram) Unfortunately the Mi Flash Tool doesn't seem to be working. I can't even get up to the bit where it would ask for an authorised Xiaomi EDL account. After clicking flash it just says 'timeout maybe the device was unplugged' or something like that and returns this string of code (taken from flash.bat)

fastboot %* getvar product 2>&1 | findstr /r /c:"^product: *karna" || fastboot %* getvar product 2>&1 | findstr /r /c:"^product: *surya" || echo Missmatching image and device
fastboot %* getvar product 2>&1 | findstr /r /c:"^product: *karna" || fastboot %* getvar product 2>&1 | findstr /r /c:"^product: *surya" || exit /B 1
set CURRENT_ANTI_VER=2
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
if %version% GTR %CURRENT_ANTI_VER% (
echo current device antirollback version is greater than this package
exit /B 1
)

fastboot %* flash xbl %~dp0images\xbl.elf || @echo "Flash xbl error" && exit /B 1
fastboot %* flash xblbak %~dp0images\xbl.elf || @echo "Flash xblbak error" && exit /B 1
fastboot %* flash xbl_config %~dp0images\xbl_config.elf || @echo "Flash xbl_config error" && exit /B 1
fastboot %* flash xbl_configbak %~dp0images\xbl_config.elf || @echo "Flash xbl_config error" && exit /B 1
fastboot %* flash imagefv %~dp0images\imagefv.elf || @echo "Flash imagefv error" && exit /B 1
fastboot %* flash imagefvbak %~dp0images\imagefv.elf || @echo "Flash imagefvbak error" && exit /B 1
fastboot %* flash aop %~dp0images\aop.mbn || @echo "Flash aop error" && exit /B 1
fastboot %* flash aopbak %~dp0images\aop.mbn || @echo "Flash aopbak error" && exit /B 1

fastboot %* flash uefisecapp %~dp0images\uefi_sec.mbn || @echo "Flash uefisecapp error" && exit /B 1
fastboot %* flash uefisecappbak %~dp0images\uefi_sec.mbn || @echo "Flash uefisecappbak error" && exit /B 1
fastboot %* flash qupfw %~dp0images\qupv3fw.elf || @echo "Flash qupfw error" && exit /B 1

fastboot %* flash metadata %~dp0images\metadata.img || @echo "Flash xbl error" && exit /B 1
fastboot %* flash tz %~dp0images\tz.mbn || @echo "Flash tz error" && exit /B 1
fastboot %* flash tzbak %~dp0images\tz.mbn || @echo "Flash tzbak error" && exit /B 1

fastboot %* flash hyp %~dp0images\hyp.mbn || @echo "Flash hyp error" && exit /B 1
fastboot %* flash hypbak %~dp0images\hyp.mbn || @echo "Flash hypbak error" && exit /B 1

fastboot %* flash keymaster %~dp0images\km4.mbn || @echo "Flash keymaster error" && exit /B 1
fastboot %* flash keymasterbak %~dp0images\km4.mbn || @echo "Flash keymasterbak error" && exit /B 1
fastboot %* flash cmnlib %~dp0images\cmnlib.mbn || @echo "Flash cmnlib error" && exit /B 1
fastboot %* flash cmnlibbak %~dp0images\cmnlib.mbn || @echo "Flash cmnlib error" && exit /B 1
fastboot %* flash cmnlib64 %~dp0images\cmnlib64.mbn || @echo "Flash cmnlib64 error" && exit /B 1
fastboot %* flash cmnlib64bak %~dp0images\cmnlib64.mbn || @echo "Flash cmnlib64 error" && exit /B 1

fastboot %* flash modem %~dp0images\NON-HLOS.bin || @echo "Flash modem error" && exit /B 1
fastboot %* flash dsp %~dp0images\dspso.bin || @echo "Flash dsp error" && exit /B 1

fastboot %* flash bluetooth %~dp0images\BTFM.bin || @echo "Flash bluetooth error" && exit /B 1

fastboot %* flash storsec %~dp0images\storsec.mbn || @echo "Flash storsec error" && exit /B 1

fastboot %* flash devcfg %~dp0images\devcfg.mbn || @echo "Flash devcfg error" && exit /B 1

fastboot %* flash abl %~dp0images\abl.elf || @echo "Flash abl error" && exit /B 1
fastboot %* flash ablbak %~dp0images\abl.elf || @echo "Flash ablbak error" && exit /B 1

fastboot %* flash dtbo %~dp0images\dtbo.img || @echo "Flash dtbo error" && exit /B 1

fastboot %* flash vbmeta %~dp0images\vbmeta.img || @echo "Flash vbmeta error" && exit /B 1

fastboot %* flash boot %~dp0images\boot.img || @echo "Flash boot error" && exit /B 1
fastboot %* flash recovery %~dp0images\recovery.img || @echo "Flash recovery error" && exit /B 1

fastboot %* flash super %~dp0images\super.img || @echo "Flash super error" && exit /B 1
fastboot %* flash userdata %~dp0images\userdata.img || @echo "Flash userdata error" && exit /B 1
fastboot %* flash vbmeta_system %~dp0images\vbmeta_system.img || @echo "Flash vbmeta_system error" && exit /B 1
fastboot %* flash cust %~dp0images\cust.img || @echo "Flash cust error" && exit /B 1

fastboot %* flash ffu %~dp0images\ffu.img || @echo "Flash ffu error" && exit /B 1

fastboot %* flash cache %~dp0images\cache.img || @echo "Flash cache error" && exit /B 1

fastboot %* erase misc
fastboot %* erase apdp
fastboot %* erase multiimgoem

fastboot %* reboot

These parts worry me:

"product: *karna" || fastboot %* getvar product 2>&1 | findstr /r /c:"^product: *surya" || echo Missmatching image and device"

and

"current device antirollback version is greater than this package"

Does anyone know what else I could try? I found this (https://romprovider.com/test-point-poco-x3-reboot-edl-mod/) but it's using software I'm unsure of. Is this my only option now do you think?