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[Q] ZOPO ZP990 wont boot after changes to /system/build.prop

OP elcomtel

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15th February 2014, 01:42 AM   |  #1  
OP Junior Member
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2 posts
Join Date:Joined: Feb 2014
Hello, I am new to xda-developers and have just joined up.

I have gone to great lengths to find an answer to my problem with Google and have searched this forum.
Not having any luck I have decided to call out for help.

My situation

- Country: Australia
- Model: ZOPO ZP990 Android phone.
- Android 4.2, Jelly Bean
- Phone is "rooted".
- No recovery backup was ever made.
- My 3G wasn't working. The best I could achieve was "2G EDGE" data connections.
- I have a good HSDPA connectivity with my old LG Android P500 phone in my area.
- As I bought the Zopo phone in China I don't have the option of "after sales service".
- I am an Android newbie and I know very little about Android systems in general.

I was very happy with this phone, except that I was having issues connecting to 3G.

I had used Mobileuncle to configure for the specific 900/2100MHz 3G service in Australia.

Setting the 3G bands with Mobileuncle for my region did not correct my problem with no 3G access.

I then followed the advice to make changes to /system/build.prop

As there were no similar entries in my default build.prop I added the following lines to the very end.

# Start Support for Australian 3G
ro.ril.hsxpa=2
ro.ril.hsdpa.category=5
ro.ril.enable.3g.prefix=1
ro.ril.hsupa.category=5
ro.ril.enable.dtm=1
ro.ril.gprsclass=12
ro.ril.enable.a53=1
# End Support for Australian 3G

I made a copy of the original /system/build.prop to /system/build.prop.bak as a backup.
I made the changes using Notepad++ (on PC) and an Android File Manager (provided root access) app.

I then rebooted and my phone hangs after it presents a ZOPO musical/visual start-up advert presentation.

My phone wont boot !!!

--------------------------------------------
<by pressing buttons on power-up I get the following>

Android system recovery <3e>

Enter: OK Key, Select : Vol UP/ Vol down
Reboot system now
apply update from ADB
apply update from sdcard
wipe data/ factory reset
wipe cache partition

--------------------------------------------
Using ADB(Android Debugging Bridge) Version 1.0.31
(I am using Mini-SDK and not the full Android SDK)
I have "Java Runtime Engine" but not "Java SDK" installed.

I connect the phone to my PC via USB and enter the "Android system recovery <3e>" environment.

I select the "apply update from ADB" on my phone.

I then enter the following commands into my PC.

C:\mini-sdk>adb version
Android Debug Bridge version 1.0.31

C:\mini-sdk>adb devices
List of devices attached
0123456789ABCDEF sideload

C:\mini-sdk>adb usb
error: closed

C:\mini-sdk>adb shell
error: closed

Besides the above commands I cannot get ADB to do anything useful.
I have "USB Debugging" turned off at the phone so I suspect this is why ADB doesn't work.
I know very little about ADB only what I have recently learnt with Google.
--------------------------------------------

I then downloaded the latest ZP990 ROM and Flash Tool V4.2

While I found the instructions straightforward I cannot establish communication between PC and phone via USB.
(I have the correct Android drivers installed on my PC and had full USB functionality before this problem started.)

Once again I suspect the fact that my "USB Debugging" is turned off prevents Flash Tool to work.
--------------------------------------------

I've noticed there is an "apply update from sdcard" in the "Android system recovery <3e>" environment.

I wonder if I can exploit this?

Is there a recovery ROM on the internet that I could download from the net to use on my sdcard?

If I could get any ROM to load, I could later use Flash Tool to do the final ROM upgrade.

Does anyone know if I could use the "apply update from sdcard" from "Android system recovery <3e>" to install a new ROM.
--------------------------------------------
Can someone please help me?

I work in the electronics/IT field, but I know very little about Android systems.
So all I need is guidance on moving forward.

If I sound like I know more about Android that is because I have done a lot of research on the internet to try and fix my phone.


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