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

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

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.


--------------------------------------------
 
sallyann
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Are you able to do an ADB PULL of the backup you took, rename it on your PC to build.prop, do an ADB REMOUNT then ADB PUSH it back?
 
elcomtel
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Join Date: Feb 2014
Default I fixed it myself !!!

No need to help me.

I found what I was looking for on the various Android websites around.

I needed to first instal the Mediatek USB VCOM drivers.

Install the latest copy of SP Flash Tool on my PC.

Down load the latest ZP990 ROM from the ZOPO website and unpack it.

Remove battery from phone for a short period. Put the battery back, but don't power up.

Start SP Flash Tool

Select the scatter-loading file from the ROM I unpacked.

Press F9 (or hit Download button) and connect your phone into the computer via USB data cable.

Things went much easier than I expected.

Lost my data, but I got my phone back.
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