I had the same issue last week with my AL319.....Blank screen after update. FRUSTRATING
I was pleasantly surprised with Autel tech support...prompt action and reflashed my unit by remote access to my computer.
I was told by tech support the AL319 is a generic reader and did not require upgrades.......hmmm.
These are my quick notes from the procedure.....
1) Download WINRAR 32 bit zip Program (Free) ....Just Google it (this program is required to open the zipped update pack)
2) GOTO Autel Website....... GOTO Software Update Pack....Download 319AL
3) Un-zip the files BIN and AUT files
4)Press and hold ENTER/EXIT on the AL319 Unit THEN plug USB cable into your computer ...it will automatically default to Program Update mode.
5) On the Autel update screen on the computer you should have a green box saying connected
6) For UPDATE select the unzipped BIN File and load it
7) For DTC select the unzipped AUT File and load it
YOU MUST LOAD BOTH THE BIN AND AUT FILE for this to work
Once this is done your unit should work.......Hope this helps