How to test drive locked vehicle?

step1:
Search for "test dive" on WT live and then you will find there is a mission called test drive leopard 2A7 and download it
step2:
open this mission's folder until found "user mission" and "content" copy then directly into the War thunder folder
step3:
Find "ussr_bt_5.blk" open it with notepad change to model:t=(the vehicle you want to test drive)
(don't add the nationality be the vehicle ID!)
step4:
open game and open user mission find this mission and play it
have fun :)

tips
if the tracks get stuck in the mold
please search for "track"in the blk
change the track model to the vehicle you want to test drive
(don't change the back)