Because there is a battery, it can get into a non-bootable state and remember it
If you have the back off, the reset button, OR a long press of pwr button
1st, try 8-10 seconds, then regular start press, if that doesn't work, 20+seconds
The "bad" uboot MUST be gone, use something that you are SURE is bootable
And, if nothing is in, nothing will happen. There must be a "good" uboot for any led
There are lots of bad uboots out there, I have had to long press maybe 15 times by now
Do remember, the emmc uboot will be found 1st, if it is bad, must be disabled or removed or blanked
If you have the back off, the reset button, OR a long press of pwr button
1st, try 8-10 seconds, then regular start press, if that doesn't work, 20+seconds
The "bad" uboot MUST be gone, use something that you are SURE is bootable
And, if nothing is in, nothing will happen. There must be a "good" uboot for any led
There are lots of bad uboots out there, I have had to long press maybe 15 times by now
Do remember, the emmc uboot will be found 1st, if it is bad, must be disabled or removed or blanked