TF300T with unlock error

[mobbylin]

Model Name: Asus Transformer Pad TF300T
Firmware Version: Android 4.2.1
Rooted or not: not
Frequency of Occurrence: all the time
APP Name & APP Version (If your issue relates to the app):
I am unable to boatload unlock the tablet TF300T.
Product serial no is C4********73, Build JOP40D.TW_epad-10.6.1.27.5-20130902
No IMEI
Thanks.
mobby

[Christine_ASUS]

Hi mobbylin 
Thank you for your asking. Your passage was edited. Please be aware that sharing the personal information like SN or IMEI on the Internet is quite dangerous.
For Pad-type models, there will no longer be any system updates and maintenance. Sorry for any inconvenience this may cause. Thank you for your understanding and support.

[mobbylin]

Hi,
Thanks for your support.
For my basic question is do I need to ask your support with my SN and IMEI to unlock my TF300T. I found many your customers to unlock the PAD from your help.
I can't run the unlock tool from download the ASUS toolkit.
I need to upgrade my TF300T to Android 7.x
Thanks
Mobby

[Christine_ASUS]

Hi mobbylin
Base on the server, your device remains locked. For Pad-type models, there will no longer be any system updates and maintenance. Besides, please note that unlocking the device or flashing the custom ROM are quite risky, may causing security issues like Widevine Issue, banking app usage issue, or unexpected software issues. If you still want to unlock the device, you may check unofficial forums for power users. Thank you.