JBL flip 4 button codes

[Pres2Hack]

Hi, I have JBL flip 4 and I'm interested to learn more about the button combinations!

Are FW (firmware) updates needful. Here are all the codes I know:

play/pause + volume up - reset
bluetooth + volume minus -low frequency mode
JBL Connect + Volume down - says the firmware number 
JBL Connect + Volume up - weird mode, possibly FW update mode (to go back, connect to powersource and hold the combination again)

 

And 1 more thing:I find some problems like stopping the blink (which indicates it is being charged) stops at 4 point and never run to 5th unless I replug it. And the sounds are getting distorted when the light hit red which indicates the battery has run short. I get it if the battery is efficiently using the juice by not using its full sound quality but when I turn up the volume at that moment,the battery runs out and the speaker shuts down.