Following the instructions on the OP, I cannot decrypt the sdcard to save my life.
First I tried with no unlock in the stock firmware. # fastboot boot recovery.img. TWRP boots fine, but when I try to flash, /sdcard is gibberish. So I set a pattern screenlock. TWRP asks for the pattern but it fails every time. So I changed to a PIN, and TWRP asks for the PIN, but it fails every time.
Happens with kiev-twrp-3.6.2_11.0_RC-1.0.img and recovery in kiev-twrp-installer-3.6.2_11.0_RC-1.0.zip
First I tried with no unlock in the stock firmware. # fastboot boot recovery.img. TWRP boots fine, but when I try to flash, /sdcard is gibberish. So I set a pattern screenlock. TWRP asks for the pattern but it fails every time. So I changed to a PIN, and TWRP asks for the PIN, but it fails every time.
Happens with kiev-twrp-3.6.2_11.0_RC-1.0.img and recovery in kiev-twrp-installer-3.6.2_11.0_RC-1.0.zip