ale-l21 dead after flash

SigmaKey v.2.33.06
531120508 Sigma dongle 2.33, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Activated
--------- 2019-10-05 18:18:25 ---------
SigmaKey 2.33.06 HiSi: Write firmware
(ADB) Writing flash...UPDATE.APP
Firmware: ALE-L21C432B525
This operation may brick the phone! Are you sure you want to proceed? [YES]
Phone model: :ALE-L21
Version: :ALE-L21C432B614
Writing flash...Done
Restarting phone...OK