error unlock vodafone smart tab iii

Unlock4samsung Friday, September 6, 2019

Hello
i cannot unlock this tab. Its factory stock firmware, i have done hard reset but I always get the same error. When sigmakey fails the tab freezes with a black screen and i have to keep the power button pressed to force a restart.
any ideas please

SigmaKey v.2.33.06
xxxx Sigma dongle 2.33, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Activated
--------- 2019-09-06 19:31:47 ---------
SigmaKey 2.33.06 ADB: Direct unlock
* daemon not running. starting it now *
* daemon started successfully *
^ Android Composite ADB Interface
Version: Linux version 3.4.5 (buildslave@bjws7) (gcc version 4.6.x-google 20120106 (prerelease) (GCC) ) #1 SMP PREEMPT Wed Aug 14 05:17:33 CST 2013
Phone model: LENOVO Vodafone Smart Tab III 7
Android 4.2.2; Firmware: JDQ39; Date: 2013å¹´ 08æœˆ 14æ—¥ æ˜ŸæœŸä¸‰ 05:19:11 CST
Version: A3000_A422_000_027_130814_VF
Baseband Firmware: MOLY.WR8.W1248.MD.WG.MP.V10.F1.P7, 2013/07/21 05:55
Baseband Processor: MT8389
Software IMEI: 357724050286586
Reading security block.....Error writing to serial port