SIM is not detected and unknown baseband after installing ROMs on lenovo A3500-HV

[ebram96]

My device is Lenovo A3500-HV
when I try to install any rom higher than cm 12.1 , the devices loses its baseband and no longer detects sim cards !
The device is guaranteed to be not bricked : stock firmware and cm12.1 work fine !
what I tried :
Flashing roms with CWM recovery or various versions of TWRP with no errors but in vain .
Backup :
- The following backup operations also done on cm12.1 which is the only working rom ! -
1- Tried backing up the nvram from my stock rom using various versions of twrp recovery and restoring back on roms but
IN VAIN !
2- Tried backing up using MTK Droid Tools but when I restore the back up on any rom it doesn't work giving this output and after rebooting nothing happens !

In system already available:  Android Debug Bridge version 1.0.32

 --->>> Connect to device <<<---
ATTENTION!  Fake Hardware in kernel or firmware doesn't correspond to phone! 
 --- ERROR  :pttycmd1 device NOT found!
 --- file  nvram.bin not selected 
 --- \data\nvram install

Other attempted methods :
1- Installing stock firmware or cm12.1 and dirty flash higher rom .
2- Mobileuncle Tools (I can't access engineering mode !) .
3- Chamelephon .
4- Maui META 3G ( It doesn't detect the device when roms installed ) .
5- Using TWRP terminal and AT+ command .
6- Deleting nvram folder .
I CAN'T ACCESS ENGINEERING MODE ON ANY ROM !
Using codes or Mobileuncle Tools , nothing gets me to the Engineering Mode !
NOTE : WIFI works fine on any rom !
I get all roms from :
http://4pda.ru/forum/index.php?showtopic=624077
and unfortunately the have no English discussion :'( .

 

[medoamer]

Fix.

My device is Lenovo A3500-HV
when I try to install any rom higher than cm 12.1 , the devices loses its baseband and no longer detects sim cards !
The device is guaranteed to be not bricked : stock firmware and cm12.1 work fine !
what I tried :
Flashing roms with CWM recovery or various versions of TWRP with no errors but in vain .
Backup :
- The following backup operations also done on cm12.1 which is the only working rom ! -
1- Tried backing up the nvram from my stock rom using various versions of twrp recovery and restoring back on roms but
IN VAIN !
2- Tried backing up using MTK Droid Tools but when I restore the back up on any rom it doesn't work giving this output and after rebooting nothing happens !

In system already available:  Android Debug Bridge version 1.0.32

 --->>> Connect to device <<<---
ATTENTION!  Fake Hardware in kernel or firmware doesn't correspond to phone! 
 --- ERROR  :pttycmd1 device NOT found!
 --- file  nvram.bin not selected 
 --- \data\nvram install

Other attempted methods :
1- Installing stock firmware or cm12.1 and dirty flash higher rom .
2- Mobileuncle Tools (I can't access engineering mode !) .
3- Chamelephon .
4- Maui META 3G ( It doesn't detect the device when roms installed ) .
5- Using TWRP terminal and AT+ command .
6- Deleting nvram folder .
I CAN'T ACCESS ENGINEERING MODE ON ANY ROM !
Using codes or Mobileuncle Tools , nothing gets me to the Engineering Mode !
NOTE : WIFI works fine on any rom !
I get all roms from :
http://4pda.ru/forum/index.php?showtopic=624077
and unfortunately the have no English discussion :'( .

Ok, I know that it's probably too late for a fix but i will just post it just in case if you still haven't had it fixed yet or incase if someone else got the same issue like me and you...

You will need both of these files:
1) A3500HV_A442_01_37_140920_ROW.7z
2) A modified Scatter File that enables the flashing of NVRAM+ the NVRAM File itself.
3) The SP Flash Tool.

I got all of them from the 4pda forum, and you can also search and download the 1st file which is an upgrade firmware with smaller size (312 MB) and i will attach the NVRAM scatter file and the NVRAM .. you will need the latest WinRAR version to etract it , and you can get the SP Flash tool easily from the same place you found the 1st file..

When you have all of them together in one folder then extract everything to its own folder name, and before anything else you need to take a full backup using Lenovo Assistant because the tablet will be reset, then open the SP Flash tool and point it to the scatter file from inside the 1st file's extracted folder (Not the NVRAM's one).
Check the "DA DL all with checksums" then click the Firmware Upgrade Option then click Download and at this point turn off the tablet and plug it using the USB cable WHILE HOLDING THE Volume Down Button and let the process finish until you see the big green check.

Power on the tablet and walk through the initial setup and at the home screen open the phone dialer and dial *#06* to make sure that the IMEI is still invalid or unknown, then turn the tablet off again.

Using the SP Flash tool select the Scatter file that i attached here with NVRAM in the same location then click Download, now plug in the tablet once more using the USB cable WHILE HOLDING THE Volume Down Button and let the process finish until you see the big green check.

That's it now just power on the tablet and check with the dialer again and you should already have the signal mark working.

 

[pc boy]

Ok, I know that it's probably too late for a fix but i will just post it just in case if you still haven't had it fixed yet or incase if someone else got the same issue like me and you...

You will need both of these files:
1) A3500HV_A442_01_37_140920_ROW.7z
2) A modified Scatter File that enables the flashing of NVRAM+ the NVRAM File itself.
3) The SP Flash Tool.

I got all of them from the 4pda forum, and you can also search and download the 1st file which is an upgrade firmware with smaller size (312 MB) and i will attach the NVRAM scatter file and the NVRAM .. you will need the latest WinRAR version to etract it , and you can get the SP Flash tool easily from the same place you found the 1st file..

When you have all of them together in one folder then extract everything to its own folder name, and before anything else you need to take a full backup using Lenovo Assistant because the tablet will be reset, then open the SP Flash tool and point it to the scatter file from inside the 1st file's extracted folder (Not the NVRAM's one).
Check the "DA DL all with checksums" then click the Firmware Upgrade Option then click Download and at this point turn off the tablet and plug it using the USB cable WHILE HOLDING THE Volume Down Button and let the process finish until you see the big green check.

Power on the tablet and walk through the initial setup and at the home screen open the phone dialer and dial *#06* to make sure that the IMEI is still invalid or unknown, then turn the tablet off again.

Using the SP Flash tool select the Scatter file that i attached here with NVRAM in the same location then click Download, now plug in the tablet once more using the USB cable WHILE HOLDING THE Volume Down Button and let the process finish until you see the big green check.

That's it now just power on the tablet and check with the dialer again and you should already have the signal mark working.

Didn't work for me!

 

[Aliover]

Hi
My device is Lenovo A3500-HV
I flashed Viper 7.1.2
but The call and messaging not working well !
Flashed any custom rom but not work
whats the wrong?