verify error after erase+write

[Gtohugo]

hello , so when i use WSON8 Chip Probe Line Read to read XM25QH256C or w25r256jven or w25q256jven ....bios it's reading normaly

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but when i flash the chip erase normal + write normal but in verify step there is error always with recent laptop 11 12 13 gen exactly dell , i need help please with this problem .

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[ArT]

Are you programming in external circuit?
Please try to increase voltage +0.2-0.3V and decrease SPI speed to 50% or 10%. If it will not work, you need to desolder the chip and programm it directly in WSON8 adapter.

[Gtohugo]

thanks for your time , i use cable wson8 and i did it with +0.2+0.3-0.2..., with speed 100% 50% 10% , i have the same problem , so with cable it's impossible ?

[ArT]

It depends mainly on external circuit, you can have bus conflict (SPI bus is shared, MCU can communicate with FLASH when you power up it). There are some tricks and workarounds. Please read Chapter 5 for more details. If you share me more details about your external circuit how FLASH is located on board and connected to power & other devices I can help to find the issue.