"but if you lost the access the battery would have to be returned to them to be stripped down and reset" This is so Fogstar, they have been using JK BMSs for ages, you only need the S/N of the BMS which Fogstar would have and then its possible to reset the PIN.as Tim says above whilst on site in silves the three of us at various times had the discharge setting turned off over 3 days once we realised what was happening an easy check and reset , after many back and forward e mails with fogstar they confirmed that you could set a password on the old app but if you lost the access the battery would have to be returned to them to be stripped down and reset though they did confirm that a password option was in development which looks like dave’s update