Cannot download any apps from windows Store - Windows Phone 8 Q&A, Help & Troubleshooting

Today i rollback my lumia 540 to windows phone 8.1.. And trying to download upgrade advisor to update it to windows 10 once again. But i saw that non of the apps were installing.. Thrown an error "c101b000". Then i tried to download another wp 8.1 device lumia 525.. Same prob....
Please can somebody inform me what happened to windows store that is preventing me from installing any apps...
Or please tell me another way to upgrade my phone to windows 10.. It is officially supported.. Please help...

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[Q] lumia 820 certificate

Hi everyone !
Recently I've tried to hack my phone to download windows 10 , so I've downloaded Lumia 630 certificate and now everytime I try to enter the windows insider application it closes automatically , I know I have to flash my phone using LSRT but I don't want to do this because I have so much apps and it takes about 4-5 hours installing apps after a reset or a flash
Can anyone here please get me a Lumia 820 certificate ? So I can enter the app without any problem , especially today is the day that windows 10 2nd preview will be available for my device and I'm so excited for it and I don't want to flash my phone
Please anyone get me the 820 certificate , its international version (country variant)
Thanks in advance

Stuck at Win8.1 | Error 801881d0

Hi everyone newbie here,
Today i saw project astroia which is allow you to install android app and games. I had some problems with application so i have to revert my phone 10 to 8.1 and again i will update it to windows phone 10 via Insider. I downgrade it to 8.1 well but when i trying to update from Insider it says there is a avaible update for windows 8.1. So i head to phone update settings start update then around %50 it shows Error 801881d0. I cant update my phone nor downgrade again and I want able to use 10 again. Thanks for help. Here is my device info.
Sorry for bad eng
Model : Lumia 925
Software : Windows Phone 8.1
IS Version : 8.10.12393.890
anyone ?
You're only permitted to bump a thread once every 24 hours. Please consider this in future. Thanks and good luck!

can't install windows 10 on Lumia 720

hello,
i had used windows 10 on my lumia 720, but due to battery issue i have to roll back to windows 8.1, now i want to go back to windows 10 through windows insider , but sadly after configuring and rebooting in insider app, i cant download windows 10 release preview anymore :crying::crying::crying:
i have reset four times and also reinstall firmware through windows recovery tool, still i cant update to win 10,
does Microsoft blocks windows 10 update
any help will be appreciate
does this news says true?
if so how can i update to windows 10
thanks in advanced
Bhg73 said:
hello,
i had used windows 10 on my lumia 720, but due to battery issue i have to roll back to windows 8.1, now i want to go back to windows 10 through windows insider , but sadly after configuring and rebooting in insider app, i cant download windows 10 release preview anymore :crying::crying::crying:
i have reset four times and also reinstall firmware through windows recovery tool, still i cant update to win 10,
does Microsoft blocks windows 10 update
any help will be appreciate
does this news says true?
if so how can i update to windows 10
thanks in advanced
Click to expand...
Click to collapse
You can try this method : http://forum.xda-developers.com/windows-10-mobile/installing-windows-10-mobile-tech-t3431454

Unable to deploy application to my brand new developer unlocked windows phone

Unable to install application. The maximum number of developer applications on this phone has been reached. Please uninstall a developer application and try again.
This is the error I am getting when I am trying to deploy application on my newly flashed and registered Lumia 530 dual sim with windows phone 8.1 update.
The problem is
I am having no developer application on my phone as it is newly flashed using windows device recovery tool.
Also I have to register my phone again and again for each time I connect my phone to my pc.
But then how to solve it?
Can anyone please help me regarding this?
Thanks in advance for all reply.
I am soo sad

Lumia 928 manual update to windows 10

Hello everyone
I do have 2 lumia 928 phones and one of those i have updated to windows 10 preview buids. I cant update the second one to windows 10 since windows insider no longer supports for it. So theres no way of updating my second lumia to WP10. I want to know whether there is a way to transfer the windows 10 installed system files from my updated lumia to other one and get it updated too. Because im running out of options....

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