I also have this pad and get this message when I want to do the update. It's just a hint that twrp might ask for a password. This would only be the case if you have set a password for your pad. You can safely ignore this message.
BR
Xanten
New TWRP on XDA works for me with the ROM 9.9.3
https://forum.xda-developers.com/k20-pro/development/recovery-unofficial-twrp-xiaomi-redmi-t3944363
BR
Xanten
Hi guys, I flashed the 9.8.15 today.
I used TWRP 37 for this.
I flashed via USB OTG. After flashing I wiped the cache and dalvik-cache.
My Android system boots up.
The only thing that doesn't work is the DND function. Calls and messages are not displayed silently.
PS: I came from the version...
I tried last weekend.
Unfortunately this attempt also ended with an empty mobile phone.
Encryption is still not possible.
ROM WEEKLY 9.2.28 / official twrp from twrp.me
BR
Xanten
I use [RECOVERY][UNOFFICIAL] TWRP for MIX 2S V14 from XDA.
My phone is a mi Mix 2s 6/128.
How long does the encryption take?
I reinstalled the ROM and encrypted it immediately afterwards.
It now runs for 9 hours
BR
Xanten
The same with me!
I pressed encryption.
The mobile phone has made a restart, then after 36 hours have broken off.
All data gone and no encryption. As it looks it does not work on this mobile phone with the EU ROM.
Edit: i use MIUI 10.3 8.12.20