rasta4rest
Member
First of all , Do with your own risk.. im not responsible for any damage caused by your action . Im just share my experience and trial , this trick is working for me To Unlock bootloader , flashing recovery with GNM Recovery from fastboot [Command Line mode] , and finally Root your device from GNM Recovery. This is just alternative root method , i dont think it's an easier than THIS method but it's worth to try.
Im on M110 Build , still hoping for anyone here upload their M130 stock build , since i cant get OTA Update from here. But i guess this method work for all build.
The starting point is here :
I've guessed that "Bypass Booting" was bootloader lock "bypassing", but how can i use that to install recovery from stock device without root access ?
Here's the step by step guide assuming everyone here has been enabling "bypass booting" - ON & C771 Boot Loader Interface driver installed on their device , just googling it or search on this forum to get the correct driver:
1. Download ADB , since im doing all my stuff from there and make sure to connect your device in computer with Debugging On [ see Setting > Application > Development > USB Debugging ] and Charge Only mode. [see attachment for ADB package for windows]
2. Execute this Command from Command Line [ im using Windows Command Line ] to Enter C771 Bootloader :
3. Check device already connected and can do the fastboot command
4. Assuming you're already have GNM Recovery image on you PC do this following command :
5. When you see something like this on CMD Windows :
6. Now boot to Android with this command :
7. After booting process completed and your PC detected your ADB interface again. Run this command from CMD Windows :

8. Make Yourself familiar with GNM Recovery Interface on you Device , you can do root and anything you could normally do from Recovery Interface.
I'm still waiting for someone Cooking Custom ROM from this lovely calculator
.
9. This is personal advisory , do a NANDROID BACKUP is strongly recomended first action after all of this done.
You should at all cost avoid to wipe /Sytem , /Boot , /etc except you really need to brick your phone for doing some development.
PS : I would prefer THIS TRICK. Once again , this is only an alternative method especially for you who have wifi error problem after rooting and lost superuser access , or accidentally restore to factory default , hoping the wifi problem gone suddenly by itself
Im on M110 Build , still hoping for anyone here upload their M130 stock build , since i cant get OTA Update from here. But i guess this method work for all build.
The starting point is here :
In the Program Menu (##PROGRAM aka ##7764726, pass 000000) I found a setting called Bypass Booting and was wondering what it was. It is set on Disable and I don't dare enable it so I was just wondering what it does and if it would help in any of our endeavors.
I searched both the forums and Google and really haven't come up with any real results.
I've guessed that "Bypass Booting" was bootloader lock "bypassing", but how can i use that to install recovery from stock device without root access ?
Here's the step by step guide assuming everyone here has been enabling "bypass booting" - ON & C771 Boot Loader Interface driver installed on their device , just googling it or search on this forum to get the correct driver:
1. Download ADB , since im doing all my stuff from there and make sure to connect your device in computer with Debugging On [ see Setting > Application > Development > USB Debugging ] and Charge Only mode. [see attachment for ADB package for windows]
2. Execute this Command from Command Line [ im using Windows Command Line ] to Enter C771 Bootloader :
you should see stuck on G'zone logo on your Device after the process completed.adb reboot bootloader
3. Check device already connected and can do the fastboot command
- the command should have result = version: 0.5 <-- or something like that , it means the device already connected [ 0x0409 --> Vendor id of C771 ]fastboot -i 0x0409 getvar version
4. Assuming you're already have GNM Recovery image on you PC do this following command :
screenshot of mine on attachment for example.fastboot -i 0x0409 flash recovery "path-to-GNM-recovery"
5. When you see something like this on CMD Windows :
That means the flashing process already done and succeed.sending 'recovery' (6748 KB)...
OKAY [ 1.689s]
writing 'recovery'...
OKAY [ 1.106s]
finished. total time: 2.797s
6. Now boot to Android with this command :
no need for disassembly battery anymore from bootloader interface and continue to normal booting.fastboot -i 0x0409 continue
7. After booting process completed and your PC detected your ADB interface again. Run this command from CMD Windows :
and you'll see GNM Recovery installed on your C771 Calculator eh sorry i mean Android Device.adb reboot recovery

8. Make Yourself familiar with GNM Recovery Interface on you Device , you can do root and anything you could normally do from Recovery Interface.
I'm still waiting for someone Cooking Custom ROM from this lovely calculator

9. This is personal advisory , do a NANDROID BACKUP is strongly recomended first action after all of this done.
You should at all cost avoid to wipe /Sytem , /Boot , /etc except you really need to brick your phone for doing some development.
PS : I would prefer THIS TRICK. Once again , this is only an alternative method especially for you who have wifi error problem after rooting and lost superuser access , or accidentally restore to factory default , hoping the wifi problem gone suddenly by itself