Warnings
All members of xda-developers, and the author can not be held responsible for any damage to any of your devices after applying the following
try at your own risk
1 ) Download and install Nokia care Sute 5 Latest Working
For Lumia 635 or otherirst Windows Phone 8.1 devices: RM-974, RM-975, RM-976, RM-977, RM-978, RM-979, RM-1010, RM-1027. link :- Nokia Care Suite PST 5.0 5.1.83.1414
2)you can use NaviFirm+ 3.2 (click here)
UPDATE :
first you need to know your mobile product code
if remove battery your product type and code will be printed there
or
open Extras + info you will see RM type like RM-xxx and choose your desired product code to flash
3 ) After installing Nokia care suite ,create a newfolder with a Name " Products" at C:\ProgramData\Nokia\Packages
it will become C:\ProgramData\Nokia\Packages\Products
Now create Your RM-xxx empty folder ,for lumia 1520 The folder name will be RM-937
in order to see hidden programdata folder click on show hidden folder in view
check your device product code list by searching like example "lumia 1520 product codes seidea.com" open first link all product code list will be there
,select Vietnam firmware for field test,in windows phone 10 10149 build we got field test by selecting 3G only in sim settings ,but we will have polling frequency and selective bands for battery save ,so i choose vietnam
in my case its look like "059V318 VAR APAC VN CV WHITE" Here VN= Vietnam.
for Lumia 1520 INDIA These are product codes which had "IN" at 4th place in sentance
059V3M9 VAR IMEA IN CV BLACK
059V3N0 VAR IMEA IN CV WHITE
059V3N1 VAR IMEA IN CV YELLOW
059V3N2 VAR IMEA IN CV RED
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5) open Navifirm and it asks for login,so click on cancel
choose your 7 letter product type and paste at search bar and press enter as seen below
click on browse and navigate to C:\ProgramData\Nokia\Packages\Products\RM-937 clik ok
and untick "Use product code as final path"
see below screen shot
click on Download to Download All Files ,it takes Time According to Internet speed
if you done correctly you will see all downloaded firmware files at C:\ProgramData\Nokia\Packages\Products\RM-937
Now open Nokia care suite and click on Product support tool for store 5
6 ) click on file ---> Open Prouct and type your phone model and select correct rm of rour phone
7 ) click on programming and select recovery
8 ) click on updated list , your phone product number and all informaton willl display ,connect your phone click start
9 )it check data packages of Firmware ask for press volumue up+power button untill it vibrates ,do the same thing click retry
10 ) check at your phone screen flashin already started ,dont distruct flashing ,keep your pc awake untill it shows recovery completed
you will flashed to desired version of Firmware .you will get full sys freespace
All members of xda-developers, and the author can not be held responsible for any damage to any of your devices after applying the following
try at your own risk
1 ) Download and install Nokia care Sute 5 Latest Working
For Lumia 635 or otherirst Windows Phone 8.1 devices: RM-974, RM-975, RM-976, RM-977, RM-978, RM-979, RM-1010, RM-1027. link :- Nokia Care Suite PST 5.0 5.1.83.1414
2)you can use NaviFirm+ 3.2 (click here)
UPDATE :
first you need to know your mobile product code
if remove battery your product type and code will be printed there
or
open Extras + info you will see RM type like RM-xxx and choose your desired product code to flash
3 ) After installing Nokia care suite ,create a newfolder with a Name " Products" at C:\ProgramData\Nokia\Packages
it will become C:\ProgramData\Nokia\Packages\Products
Now create Your RM-xxx empty folder ,for lumia 1520 The folder name will be RM-937
in order to see hidden programdata folder click on show hidden folder in view
check your device product code list by searching like example "lumia 1520 product codes seidea.com" open first link all product code list will be there
,select Vietnam firmware for field test,in windows phone 10 10149 build we got field test by selecting 3G only in sim settings ,but we will have polling frequency and selective bands for battery save ,so i choose vietnam
in my case its look like "059V318 VAR APAC VN CV WHITE" Here VN= Vietnam.
for Lumia 1520 INDIA These are product codes which had "IN" at 4th place in sentance
059V3M9 VAR IMEA IN CV BLACK
059V3N0 VAR IMEA IN CV WHITE
059V3N1 VAR IMEA IN CV YELLOW
059V3N2 VAR IMEA IN CV RED
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
5) open Navifirm and it asks for login,so click on cancel
choose your 7 letter product type and paste at search bar and press enter as seen below
click on browse and navigate to C:\ProgramData\Nokia\Packages\Products\RM-937 clik ok
and untick "Use product code as final path"
see below screen shot
click on Download to Download All Files ,it takes Time According to Internet speed
if you done correctly you will see all downloaded firmware files at C:\ProgramData\Nokia\Packages\Products\RM-937
Now open Nokia care suite and click on Product support tool for store 5
6 ) click on file ---> Open Prouct and type your phone model and select correct rm of rour phone

7 ) click on programming and select recovery

8 ) click on updated list , your phone product number and all informaton willl display ,connect your phone click start

9 )it check data packages of Firmware ask for press volumue up+power button untill it vibrates ,do the same thing click retry

10 ) check at your phone screen flashin already started ,dont distruct flashing ,keep your pc awake untill it shows recovery completed

you will flashed to desired version of Firmware .you will get full sys freespace
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