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 Edited by hygy at 2020-2-3 20:31  
 
I have some questions: 
 
- How can I install google services/google play on orange pi 4?
 
 
  
 
What I tried: 
- downladed open google apps (arm64 -> 8.1 -> micro) 
- boot into recovery mode (by pressing recovery button on board then give power) 
- select install update.zip from sd card 
 
then I got: 
-- Install /mnt/external_sd/update.zip 
E:setup_install_mounts, expect/mnt/external_sd 
Finding update package... 
Opening update package... 
Verifyng update package... 
E:failed to verify whole-file signature 
Update package verification took 10.0 s (result 1). 
E: Signature verification failed 
E:error: 21 
Installation abborted 
 
- I have a serial TTL level GPS module, how can I install it under android, and where I need to connect?
 - How can I power off the android and send to sleep mode?
 - What type of sensor I need to auto rotate the screen, and what I need to set in android?
 - How can I measure the connected battery charge state, and display it on android? What hardware I need, and what software settings?
 
 
  
 
When I got the answers I keep udating this post, for others. 
 
 
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