TL866II+ flashing in circuit

[blazini36]

I've been flashing the BIOS chip on a Steam Deck, trying out some changes and I have not been able to successfully flash this chip with the clip in circuit at all. Every time I have had to desolder the chip and place it in an adapter. The chip is a
Winbond W25Q128JW if it matters.

I saw an old thread some days ago where people were discussing this programmer and saying that you can get by overcurrent protection by bridging C22. I tried that on one of my TL866II+'s and it didn't help. I have 2 of these things. I never get a an overcurrent error in the Xgpro software, or the minipro Linux software, it just fails. In Xgpro there is a dropdown to select the vcc current but it's greyed out on mine, I guess my programmers don't support current selection?

Everybody I spoke to says they can flash this chip with the clip using a CH341A programmer with a 1.8v adapter. I may just buy one of those but I already have way too much crap laying around that I use twice a year. Anyone have any success with this programmer in circuit? It's been good for pretty much everything else I do so I'd rather just make it work if possible.

[coromonadalix]

sometimes it is possible if you maintain the cpu in constant reset and use pomona clips, or good brands ...

but you need to check  if the write is possible IE: pcb pins are not grounded or pulled at vcc,     it is better to unsolder it and put it into a dedicated socket

for soic ic's  you have 2 possible width sizes

[blazini36]

I've been desoldering and using an adapter but I have alot of tests to do and theres no space to rig up a socket on the PCB. Like I said, I know people get away with using those cheap CHA341 programmers with adapters and the same clip, so I know it can be done. Those CHA341A/1.8v setups are just so jank it's hard to bring myself to do it.