I successfully flashed ASUS PRIME H270-PLUS and everything works with i3 9100.
Theres no need for flash programmers at all, no soldering or any physical mods . Just before flashing go to Advanced → PCH-FW Configuration → ME Operation Mode and set to Temporary Disable. That allows ME to be re-written.I had Me firmware Version is 11.8.50.3470 and everything worked fine.
I used coffetime 0.85a to make modded bios, and AFU v3.05.04 to extract old bios and flash.
1.Download coffeetime 0.85a and AFU v3.05.04
2.Open AFU and press save, to save your motherboard bios
3.Download latest Bios 1205 from asus website
4.Open CoffeeTime as administrator and select 1 - Select source BIOS for mod
5.Select the option you want in my case i used 5 - i3 8xxx / Pentium G55xx, G5600 / Celeron G4900, G4900T, G4920
6.Select 2 - Unlock regions
7.Select 1 - AutoUpdate and than i - Try to inject all CFL microcodes with keep existed (Experimenal, ASUS only)
8.Select 3 - Setup personal data and than Select 3 - Select BIOS file for data transfer and browse to the Bios you saved from AFU
9.Than you select e Finalize mod , Restore capsule? choose no and exit.
10.Find created .bin file in CoffeeTime folder an rename it from .bin to .rom
11.Transfer .rom file to AFU folder
12.Before flashing go to Advanced → PCH-FW Configuration → ME Operation Mode and set to Temporary Disable.
13.When booted into windows open windows command promt as administrator and flash .rom bios file using afuwinx64.exe BIOSFILENAME.rom /GAN
14.When done restart and new CPU should work.
Also this video helped me even though its in russian
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