Mi3 Stuck on MIUI logo - can't backup data with adb pull

Hi
I've tryed to install Lollipop trough TWRP on my Mi3 without erasing the usera data (I know... it's not something that I usually do)
because I wanted to keep the data inside the internal sdcard

After that, the phone got stuck in the "MIUI bubble" screen, without wanting to boot the launcher etc

so I got back to mi recovery
I installed a custom mi3 Rom, but same problem
stuck at MIUI logo just before where the OS usually start working

now I'm on CWM recovery 6.0.5.0(R8) by furniel & donbot

trying to backup the internal sdcard trough adb
but something is not going right

adb pull /sdcard/0/ c:
start copying the files and the folders
but after a while, something with :nopm: shows, and "no such file or directory" text appear on the prompt window, and ADB stops copying the files

what can I do?
I just want to copy what's inside my phone, and the use the xiaomi pc tool (with phone in fast boot) to hopefully return to a working phone

why ADB stop working after a while?
any solution?