I just set a new name, and password for my JK BMS B2A8S20P ... for a DIY 14 Volt LiFePO4 build; after studying the manual.
... the way it worked for me on that BMS ... was on "Status" page/ I hit 3 bars on top left to get the bluetooth connect page, and then hit the "pen" for edit. ... I modified name from there 1st. / but could not Modify Password from there on first try. On my set up, I had to give default 123456 password on advance settings page, ... then hit "Modify PWD" , ... and from there I was able to proceed. for a password change. Now I have a new name for this BMS, and a new password (wise protection for a boat dock area). ... I will do this later on the 48V JK BMS I set up earlier/ and now think this procedure will work fine (& would come back here and report if not). If you have issues w the password not being accepted/ my thoughts are 1st your reboot app/ and if that does not work ... reboot your phone ... before worrying (like I briefly did) about a Bricked BMS ... ... My Two Cents on JK BMS Name & Password changes. I think my choice of 2A Active/ 200 Amp capable JK BMS was a wide choice/ think they represent the best evoltion for my BMS options in 2023. ... My Two Cents