Same problem here. My camera initially wouldn't connect to my iOS device (apparently it said it needed to update, but I couldn't read it in chinese. Later I asked a chinese friend). Then I used another app called WeTrip Lite, and it kinda worked, but it stopped and started on a reboot loop. It would start, one beep, then two beeps, then after 10~ seconds it would go off, one beep and two beeps again.
From here, I tried the normal firmware update, downloaded the last version from the official page and put it on the SD root folder (formatted in FAT32 using Linux Mint). It would go on (one beep, two beeps) and then it would start flashing and beeping, and my happiness lasted exactly 10 seconds. Surprise! the reboot loop is still a thing, so it would never update.
This is when I went berserk on the internet and found the autoexec.sh solution. Downloaded the two files, put them on the SD and when I turned on my camera (using the battery) BOOM! Dead!!! The frontal, top and bottom leds are all on red. I thought it would be a matter of time for it to start blinking, so I left it around 10 minutes. After seeing that the blue blinking signaling the firmware update would never start, I removed the battery, and then proceeded to check the SD contents. Turns out the script was executed, but the output file only had some unreadable characters on the first line and that was it.
Now my camera is useless, there's nothing I can do (I tried several buttons combinations, etc) to get it working again.
I wrote a mail to banggood, to see if they can exchange it, as I got it TODAY (yes, you read correctly, I broke it the same day it arrived from a long shipping from singapore... frustrating right? )
One thing I think didn't help my case is that I'm using a class 4 SD. I don't know if that can break the camera (doesn't sound like it would) but yeah, here I am
If you have any more suggestions for me to try in order to save the camera (and save the horrible hassle of shipping it back so they refund/exchange it) please, let me know
Thanks!