We have been using the bq27520-G4 (3.29) for a while now. I recently needed to reprogram the gold image due to a change in battery pack composition. I unsealed it, reprogrammed the original firmware (senc file using EVSW) then programmed the new golden image. The current reading is now offset by over 500mA on two units (535 and 543 to be precise). Otherwise the readings appear generally correct whether under load or charging.
I tried restoring the stock firmware without our golden image and Gauge Studio still reports the same erroneous current. Other parameters such as voltage and temperature appear to be correct.
Does anyone have any idea why this might have happened and what can be done to correct it? Or have the chips failed somehow?
Cheers, Ross