Sometimes there are connection issues with the usb driver on newer windows Os Systems with the vita.
I had the same problem and my vita would not connect with qcma over usb.

Thankfully i found this thread: http://wololo.net/talk/viewtopic.php?f=54&t=34677&start=250

Download and use the program (zadig) and change the usb drivers. Worked really well for me~

 

Try turning on airplane mode, restart your vita, and try the transfer again.

 

Check and see if you have the official CMA from Sony installed. If so, uninstall it and try again, it's known to cause the occasional issue with QCMA.

 

Instead using ICON.VPK, just leave the original ICON0.PNG and PARAM.SFO,
create a subfolder and place your .vpk or other game files there. example:

PSAVEDATA > your Account ID > BACKUP > ICON0.PNG
PSAVEDATA > your Account ID > BACKUP > PARAM.SFO
PSAVEDATA > your Account ID > BACKUP > PCSE00000
PSAVEDATA > your Account ID > BACKUP > PCSE00000 > YOUR FILES FOR TRANSFER

Refresh QCMA's Database and wire the files in AFTER
you have activated at least Henkaku Release 3!!!!!!!!

If your VITA is not activated and SEN Account not created,
there will be no Account ID in your Vita Registry file.

system.dreg:

Code:

  Offset(h) 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F

  000261E0  12 34 56 78 90 AB CD EF 00 00 00 00 00 00 00 00  .4Vx.«Íï........
  000261F0  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  00026200  0F 00 01 00 20 00 08 00 08 00 0F 00 07 00 1D B8  .... ..........¸
  00026210  88 C9 FF 00 00 00 00 00 00 00 00 00 00 00 00 00  ˆÉÿ.............
  00026220  02 70 72 69 76 61 63 79 5F 63 6F 6E 66 69 72 6D  .privacy_confirm
  00026230  61 74 69 6F 6E 00 00 00 00 00 00 00 03 00 00 00  ation...........

12 34 56 78 90 AB CD EF = Account ID

 

When it happened to me a couple days ago, I fixed it by closing QCMA and restarting it. Using USB-K drivers. This applies to both WiFi connection and USB connection.

Edit: Note, after rebooting the Vita, I always run the Henkaku exploit (currently on version 4) to get around the update nag, then I run Content Manager on the Vita.

 

Did you by accident delete a folder that is needed for transfering?

I had this once after moving psp folder, restoring via ftp fixed that.

(Replace PCSEXXXXX with the one from the game)

1. Exctact your .vpk (zip)
2. Remove everything inside your vpk except eboot.bin and sce_ folders (repack without creating new zip)
3. Move your .vpk and game content files to QCMA's Backup folder for PSP Saves
ex. PSVBACKUPFOLDER:\PSAVEDATA\<your unique id>\TRANSFER\PCSEXXXXX
4. Place ICON0.PNG and PARAM.SFO (you can use it from backup installer)
in PSVBACKUPFOLDER:\PSAVEDATA\<your unique id>\TRANSFER\
5. Refresh QCMA's Database
6. Connect your PSVITA via USB
7. Transfer your 'PSP Savegame' to your PSVITA
8. Open up VitaShell and browse to ux0:/PSPEMU/PSP/SAVEDATA/TRANSFER/PCSEXXXXX
9. Install your .vpk and activate FTP when its done
10. Move the gamefiles to ux0:/app/PCSEXXXXX via FTP (it can't overwrite, make sure all needed files get moved)
--- DONE ---

You can also use VPK Shrink to create a small insteller vpk and extracted folder.

 

Simple problem, I ran into as well.

EASY FIX
CLOSE ALL QCMA ON YOUR TASK TRAY IN WINDOWS.
PLUG THE VITA IN THE PC
THEN BOOT UP QCMA AGAIN.
THEN BOOT CONTENT MANAGER IT WILL NOW DETECT IT.

THE TRICK IS REBOOTING UP QCMA IF YOU RUN INTO CANNOT CONNECT PC.

 

The same error "The pc has been disconnected"

— Posts automatically merged - Please don't double post! —

Can you make a youtube video?
I am not sure what is unique id

 

Might not be your solution but the thing that worked for me was disabling USB Charging in the Vita settings.

 

i thank each and everyone for helping me here in this topic context.

ok,This issue was resolved.

I uninstalled QCMA and CMA.

Picked up the newly released version of QCMA. Installed it.
'
While installation final step, it asks you to choose a usb driver for the vita. Never tick the default one. Use the alternative one which is Libusb-k(i guess).

Baaam it works