ISDT Q6 Plus - how to fix impossible calibration

It may happen that these chargers are reading incorrect cell voltage. If it reads very wrong, it is not possible to calibrate the reading correctly. ( /- ) is the maximum calibration possible. To circumvent the problem, I calibrated every cell up and chose LiHv charging with cell voltage. Then the charger believes that a fully charged battery has per cell, while the actual voltage is . However, LiHv batteries can no longer be fully charged.