Lenovo Tablet 2 1050L boot failure after attempted root

I hope someone can help me. I have a LTE enabled Lenovo Tablet 2 1050L which I attempted to root using the instructions given here … https://forum.xda-developers.com/thi…let-2-t3251571 … but I have managed to brick my device. I successfully installed SuperSU but then read that Magisk was better and tried the same procedure with that but it didn’t work. Now when the tablet starts up, I get a message which says … “EFILINUX ERROR [android_image_start_buffer:737] boot image digital signature verification failed : 0000001A” which appears over the initial Lenovo splash screen. I then get to the Android system recovery menu but I can’t get the table any further than this. I have tried wiping data / factory resetting but this does not work.

I can boot the tablet into recovery mode using CWM or TWRP but I have no idea what to do now. I guess I shouldn’t have messed. I hope someone can help.

Kind regards