use wire and solder pin (I show in top picture)
after soldering wire connect to PC
if you see 2268 pram
cut the wire (but no disconnect flash)
download uptool ver2093
go setup
first in user interface
enabled clean button
after do that
in main menu click clean flash
to erase all the old bad firmware
after clean flash
firmware again
in settings flash memory
downgraded flash
low level
smart test
ecc 12

good luck
4200 is phison 2251-68
before connect to PC
hold 29+30 band pin
to get the ROM code mode
if you real old article get that
after see the drive you can
re firmware uptool 2093
and capacity mode
band is downgraded
2c mean to capacity mode
to day i fix 2207+a19 tlc toshiba

but to day just update ony isp And Dont clean nand in uptool

put this line in mp.ini

wite wire +5 volt
orange wire GND
blue pin is (eml3020 (pin 4 (out put 3.3)
in final

ic name is no matter ,you can use any ic (5v to 3.3)

first read the datashet
and may be ic pin is different
so READ THE DATA SHET and do that
good luck

find very old flash (some smi ) have 5 to 3.3 volt
ok so many people say cant find on smd market

how i find?
alex used flash extractor and tell me controler name and nand name \
example phison 2207 th58teg8t2jta20
Fortunately firmware 5.2.53 work with A19nm TLC ,15NM tlc toshiba and sandisk
good luck
Device Revision: 1100 is smi
dear roman

your flash is smi

connect 29+30 nand flash pin
Re Soldring nand pin

your flash nand pin is unplug solder again
flash must have a nand id
Flash ID code: EC1AA8DE — Samsung K9BFGD8U1M — 2CE/Single Channel [TLC-8K] -> Total Capacity = 32GB
also to day silicon power give RepairBox.exe you can download from site