Hi Neil
Thank you for quick answer and advice.
TBH I didn't find information mentioned by you.
I will order capacitors and let you know about the effects.

regards,
Kris

Hi
Dataman Pro40 + WINGONEER SOIC16 SOP16 Test Clip
chip Winbond W25Q256JVxxQ [SOIC16]

Every time when we trying to read/write the chips, during the 'verifying device' step, we observe an error:
"..
Error #6 (0/3300/5485/1479)
Supply or programming voltage of the device is out of valid range
This ...