How delete system files in WP8.1? - Windows Phone 8 Q&A, Help & Troubleshooting

I have problem remove or change some files is WP8.1. I have unlocked/hacked Lumia 530 and when try delete or rename some system files from my PC by USB I get error mesage some like I not have permissions for remove this file.
Example i try delete this file: \Windows Phone\Phone\Data\Users\WPCOMMSSERVICES\APPDATA\Local\UserData\Phone , and get error message.
How set permission for this operation or how solve this problem?

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How Do I Restore My contacts.link Back on the 8925 tilt

Im getting this message when i select contacts:THE FILE'POCKETCM CANNOT BE OPENED.EITHER IT IS NOT SIGNED WITH A TRUSTED CERTICATE,OR ONE OF ITSCOMPONENTS CANNOT BE FOUND.IF THE PROBLEM PERSISTS,TRYING TO REINSTALLING OR RESTORING THIS FILE SOMEONE PLEASE HELP ME
either reinstall from a cab if you have one or if you have the entire set of files compressed in a zip/rar you can extract them to a folder on the storage card and copy the pocketcm.exe program and paste it into the start menu in the windows folder as a shortcut

[Q] Cannot delete file

I Downloaded a WinRAR file onto my S5 for my computer. It is in my downloads folder on the internal storage of my S5. I have deleted everything out of the folder itself but cannot delete the folder. It annoys me. When I try to delete it I get this dialog box:
"Error deleting folder" Cannot delete WinRAR 5.21 Final(x86-x64) Pre-Activated 100(weird Chinese symbol) an install: The storage is write protected.
Remove the write protection and try again.
I am not stupid...I've tried everything I could think of and cannot remove the write protection or anything. For some reason I think it may be because of the weird Chinese symbol that is after the "Pre-Activated 100"
I cannot rename it, modify it or anything. It is the only file I am having a problem with. Can anybody help me with my OCD?
Is your phone rooted? If yes, you can either use adb or just a terminal emulator app, and delete the cr.p of that file!
Edit: the command you're looking for:
su
cd /mnt/sdcard
rm -r Download
That will remove the Download folder along with all its content. (this is irreversible)

can not create file/folder in system area (phone already rooted)

I want to use root explorer to copy some file into some system folder,
root explorer can successful mount system as RW. but when I copy files, it failed and show "read-only".
the strange things is: I can rename or modify a file/ folder, for example: I can modify "build.prop" and save it successfully.
so the problem is: I can't create new files or folders, but I can modify existing file an folders?

Question File Write protected

Hello all, Today I notice that I am unable to delete or transfer a file from my telegram folder. Whenever I try to either delete it or transfer it to my PC it shows a message stating that the file is write-protected. Any suggestions on how to undo this?
File location
S21 Ultra\Phone\Android\data\org.thunderdog.challegram\files\documents

Question How to edit xml files in /system/etc without root

Everytime I try to copy the file from the directory above with adb it will say "no such file or directory" even though it is there when I list it? Has anyone else encountered this issue?
need root

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