FRP Lock on + "Firmware upgrade error..." on a rooted device

Hi, some months ago, I rooted my phone, and it was a success. But yesterday, it shutted down because it ran out of battery so I connected it to the PC (only to charge it) and then to the normal power supply (I'm Italian, I don't know what it is in English ;D). Then I rebooted it, but it got stuck on the phone s/n screen, and in the top left corner there was the green text saying "Custom binary blocked by frp lock). After some rebootings I decided to flash the stock rom from Odin, but it failed: the screen showed another time the green text from the FRP Lock (still in the downloading mode) and the loading bar was frozen. Odin showed just the log and "success 0 / failed 1" at the end. Soooo..... now I'm getting "Firmware upgrade encountered an issue".... + I realized just now that my s/n is SM-J320FN and I tried flashed a SM-J320F rom....
- I tried to enter CWM
- Kies shows that it is "Connecting..." but nothing happens
- Hard reset shows me the firmware upgrade error
I can still enter Download Mode if I pull out the battery, and it says:
ODIN MODE
SECURE DOWNLOAD: ENABLE
CURRENT BIN: Custom
SYSTEM STATUS: Custom
FRP LOCK: ON

it's a Samsung Galaxy J3 6 (SM-J320FN)
Thta's my first post, and I didn't find the correct place to post this thread on

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