[Xiaomi Poco F3 / Xiaomi Mi 11X / Redmi K40] lack93:
I did some research on payload and was able to extract the .img files from the recovery file. But, some if the files were missing (qupfw, tz, uefisecapp, xbl, xbl_config).

I was able to obtain these files and rest from the firmware zip (xiaomifirmwareupdater website).

After moving the files to platform-tools I flashed all the files and everything was successful, when I flashed reboot it booted back into Fastboot.

So, I tried to flash boot_ab boot.img and it was successful but it booted back into the POCO boot screen.😞

Microsoft Windows [Version 10.0.19045.4651]

(c) Microsoft Corporation. All rights reserved.

C:\Users\lacke\Desktop\POCO\New folder\platform-tools> fastboot flash abl_ab abl.img

Warning: skip copying abl_ab image avb footer (abl_ab partition size: 0, abl_ab image size: 208896).

Sending 'abl_ab' (204 KB) OKAY [ 0.016s]

Writing 'abl_ab' (bootloader) Partition abl_a flashed successfully

(bootloader) Partition abl_b flashed successfully

OKAY [ 0.007s]

Finished. Total time: 0.073s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash aop_ab aop.img

Warning: skip copying aop_ab image avb footer (aop_ab partition size: 0, aop_ab image size: 204800).

Sending 'aop_ab' (200 KB) OKAY [ 0.010s]

Writing 'aop_ab' (bootloader) Partition aop_a flashed successfully

(bootloader) Partition aop_b flashed successfully

OKAY [ 0.006s]

Finished. Total time: 0.047s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash bluetooth_ab bluetooth.img

Warning: skip copying bluetooth_ab image avb footer (bluetooth_ab partition size: 0, bluetooth_ab image size: 421888).

Sending 'bluetooth_ab' (412 KB) OKAY [ 0.018s]

Writing 'bluetooth_ab' (bootloader) Partition bluetooth_a flashed successfully

(bootloader) Partition bluetooth_b flashed successfully

OKAY [ 0.009s]

Finished. Total time: 0.065s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash cmnlib_ab cmnlib.img

Warning: skip copying cmnlib_ab image avb footer (cmnlib_ab partition size: 0, cmnlib_ab image size: 397312).

Sending 'cmnlib_ab' (388 KB) OKAY [ 0.011s]

Writing 'cmnlib_ab' (bootloader) Partition cmnlib_a flashed successfully

(bootloader) Partition cmnlib_b flashed successfully

OKAY [ 0.009s]

Finished. Total time: 0.053s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash cmnlib64_ab cmnlib64.img

Warning: skip copying cmnlib64_ab image avb footer (cmnlib64_ab partition size: 0, cmnlib64_ab image size: 516096).

Sending 'cmnlib64_ab' (504 KB) OKAY [ 0.015s]

Writing 'cmnlib64_ab' (bootloader) Partition cmnlib64_a flashed successfully

(bootloader) Partition cmnlib64_b flashed successfully

OKAY [ 0.007s]

Finished. Total time: 0.057s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash devcfg_ab devcfg.img

Warning: skip copying devcfg_ab image avb footer (devcfg_ab partition size: 0, devcfg_ab image size: 57344).

Sending 'devcfg_ab' (56 KB) OKAY [ 0.006s]

Writing 'devcfg_ab' (bootloader) Partition devcfg_a flashed successfully

(bootloader) Partition devcfg_b flashed successfully

OKAY [ 0.008s]

Finished. Total time: 0.056s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash dsp_ab dsp.img

Warning: skip copying dsp_ab image avb footer (dsp_ab partition size: 0, dsp_ab image size: 67108864).

Sending 'dsp_ab' (65536 KB) OKAY [ 1.417s]

Writing 'dsp_ab' (bootloader) Partition dsp_a flashed successfully

(bootloader) Partition dsp_b flashed successfully

OKAY [ 0.211s]

Finished. Total time: 1.680s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash featenabler_ab featenabler.img

Warning: skip copying featenabler_ab image avb footer (featenabler_ab partition size: 0, featenabler_ab image size: 90112).

Sending 'featenabler_ab' (88 KB) OKAY [ 0.005s]

Writing 'featenabler_ab' (bootloader) Partition featenabler_a flashed successfully

(bootloader) Partition featenabler_b flashed successfully

OKAY [ 0.008s]

Finished. Total time: 0.110s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash hyp_ab hyp.img

Warning: skip copying hyp_ab image avb footer (hyp_ab partition size: 0, hyp_ab image size: 446464).

Sending 'hyp_ab' (436 KB) OKAY [ 0.020s]

Writing 'hyp_ab' (bootloader) Partition hyp_a flashed successfully

(bootloader) Partition hyp_b flashed successfully

OKAY [ 0.010s]

Finished. Total time: 0.084s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash imagefv_ab imagefv.img

Warning: skip copying imagefv_ab image avb footer (imagefv_ab partition size: 0, imagefv_ab image size: 2097152).

Sending 'imagefv_ab' (2048 KB) OKAY [ 0.059s]

Writing 'imagefv_ab' (bootloader) Partition imagefv_a flashed successfully

(bootloader) Partition imagefv_b flashed successfully

OKAY [ 0.015s]

Finished. Total time: 0.208s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash keymaster_ab keymaster.img

Warning: skip copying keymaster_ab image avb footer (keymaster_ab partition size: 0, keymaster_ab image size: 282624).

Sending 'keymaster_ab' (276 KB) OKAY [ 0.014s]

Writing 'keymaster_ab' (bootloader) Partition keymaster_a flashed successfully

(bootloader) Partition keymaster_b flashed successfully

OKAY [ 0.010s]

Finished. Total time: 0.169s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash modem_ab modem.img

Warning: skip copying modem_ab image avb footer (modem_ab partition size: 0, modem_ab image size: 287027200).

Sending 'modem_ab' (280300 KB) OKAY [ 7.662s]

Writing 'modem_ab' (bootloader) Partition modem_a flashed successfully

(bootloader) Partition modem_b flashed successfully

OKAY [ 0.879s]

Finished. Total time: 8.643s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash qupfw_ab qupfw.img

fastboot: error: cannot load 'qupfw.img': No such file or directory

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash tz_ab tz.img

fastboot: error: cannot load 'tz.img': No such file or directory

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash uefisecapp_ab uefisecapp.img

fastboot: error: cannot load 'uefisecapp.img': No such file or directory

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash xbl_ab xbl.img

fastboot: error: cannot load 'xbl.img': No such file or directory

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash xbl_config_ab xbl_config.img

fastboot: error: cannot load 'xbl_config.img': No such file or directory

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash qupfw_ab qupfw.img

Warning: skip copying qupfw_ab image avb footer (qupfw_ab partition size: 0, qupfw_ab image size: 57344).

Sending 'qupfw_ab' (56 KB) OKAY [ 0.004s]

Writing 'qupfw_ab' (bootloader) Partition qupfw_a flashed successfully

(bootloader) Partition qupfw_b flashed successfully

OKAY [ 0.006s]

Finished. Total time: 0.051s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash tz_ab tz.img

Warning: skip copying tz_ab image avb footer (tz_ab partition size: 0, tz_ab image size: 3190784).

Sending 'tz_ab' (3116 KB) OKAY [ 0.076s]

Writing 'tz_ab' (bootloader) Partition tz_a flashed successfully

(bootloader) Partition tz_b flashed successfully

OKAY [ 0.012s]

Finished. Total time: 0.146s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash uefisecapp_ab uefisecapp.img

Warning: skip copying uefisecapp_ab image avb footer (uefisecapp_ab partition size: 0, uefisecapp_ab image size: 126976).

Sending 'uefisecapp_ab' (124 KB) OKAY [ 0.005s]

Writing 'uefisecapp_ab' (bootloader) Partition uefisecapp_a flashed successfully

(bootloader) Partition uefisecapp_b flashed successfully

OKAY [ 0.009s]

Finished. Total time: 0.058s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash xbl_ab xbl.img

Warning: skip copying xbl_ab image avb footer (xbl_ab partition size: 0, xbl_ab image size: 3575808).

Sending 'xbl_ab' (3492 KB) OKAY [ 0.086s]

Writing 'xbl_ab' (bootloader) Partition xbl_a flashed successfully

(bootloader) Partition xbl_b flashed successfully

OKAY [ 0.026s]

Finished. Total time: 0.170s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash xbl_config_ab xbl_config.img

Warning: skip copying xbl_config_ab image avb footer (xbl_config_ab partition size: 0, xbl_config_ab image size: 102400).

Sending 'xbl_config_ab' (100 KB) OKAY [ 0.007s]

Writing 'xbl_config_ab' (bootloader) Partition xbl_config_a flashed successfully

(bootloader) Partition xbl_config_b flashed successfully

OKAY [ 0.012s]

Finished. Total time: 0.074s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot reboot

Rebooting OKAY [ 0.000s]

Finished. Total time: 0.004s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot flash boot_ab boot.img

Warning: skip copying boot_ab image avb footer (boot_ab partition size: 0, boot_ab image size: 134217728).

Sending 'boot_ab' (131072 KB) OKAY [ 3.145s]

Writing 'boot_ab' (bootloader) Partition boot_a flashed successfully

(bootloader) Partition boot_b flashed successfully

OKAY [ 0.425s]

Finished. Total time: 3.659s

C:\Users\lacke\Desktop\POCO\New folder\platform-tools>fastboot reboot

Rebooting OKAY [ 0.000s]

Finished. Total time: 0.006s