Change the USB port (preferably use a rear port on a desktop) and ensure the cable is in good condition.
The STJ100-1 is the variant. Other variants (STJ100-2, STJ100-3, STJ100-4) have different radio bands. blackberry z3 stj100-1 autoloader developer
Shipped with BlackBerry 10.2.1 and is officially upgradable to BlackBerry 10.3.1 and 10.3.2 . Change the USB port (preferably use a rear
If the phone remains stuck on the BlackBerry logo for an extended period, it is often useful to re-run the autoloader again to ensure a clean install. Popular Autoloader Versions for Z3 STJ100-1 blackberry z3 stj100-1 autoloader developer
The LED indicator on the phone will turn green. The command prompt on the computer will display the progress. Do not disconnect the phone during this process.