SDB Tool for instance here:
Sorry, I don't understand.....
I can only find
But there is...
For me Dandelion is the best..
Is this compatible with 21d baseband?
Yes, I confirm
What you guys might need is a command which should put your phone on usable state.
In this case of a bootloop into recovery you just need 6 steps.
1. Download the aroma file manager. It has a build in terminal console. Get this one here:
I find the way to do the job :
First : install Microsoft MTP driver
Second : install LGUnitedMobileDriver_S52MAN314AP22_ML_WHQL_Ver_3.14.1.exe