How do I get out of bootloop? I cant access safemode.

[AC Question]

Samsung Galaxy Tab3 7 / SM-T210


I [stupidly] used Kingoroot to root my device. and now it wont start up properly. It keeps flashing the name Galaxy Tab3 and then rebooting, in a loop.

i tried the POWER + VOLUMEUP many times, and I cant raise any kind of system tool at all. It just wont respond. also tried POWER + VOLUMEDOWN

nothing.

Any advice would be appreciated.
thanks
Nick