Help Read-Only File System while pushing via adb

[Qooex]

I've tried running a script for TA partition restoration (I had it backed up) but ended up with "Permission denied" error while it tried pushing a file into my internal sdcard.

=======================================
PUSH BACKUP TO SDCARD
=======================================
failed to copy 'tmpbak\TA.img' to 'sdcard/restoreTA.img': Permission denied

*** Restore unsuccessful. ***

So I opened up adb myself to see if I am able to push manually but it fails despite what destination I choose with "error: Read-Only file system".

android-sdk-windows\platform-tools>adb
push C:\yo.txt root\sdcard
adb: error: failed to copy 'C:\yo.txt' to 'root\sdcard': Read-only file system

Any thoughts?