root:Z2jciR does not appear to work on E75 (FW 6.22.68) or at least not on SSH and Web login. I did however manage to login as fliruser with the good old 3vlig and was able to find some bcrypt hashes from users.db inside /home/rootThe above hashes are the same for all.
developer$2y$10$LBNcMBC/Bn3VVnhlI1j7huOZ.UOykGaq3VZ.YAgu0mAZXAQ8q36uG
service$2y$10$syAL0yMLBfN/8.sciVnCE.kBto6mtVvjrmyhPQAo7oV3rq8X8pBke
viewer$2y$10$lxA0o325EuUtVAaTItBt.OSpZSfxIrT56ntm7326FQ/fTBc0ODWqq
user$2y$10$O5Ybml6qN9caTjezQR0f8.z230PavQYUwmZCzMVxL6BMeNvLWEr9q
admin$2y$10$/J/KDhh0.UDg5pbwtPG9B.W2gEWrS36qHji1scgxO7uiTk1GuAa.K
UPDATE: The root password hash was world-readable and is $1$T5f7njVX$itbwBbH5SnomehGVWTQ5y/ and according to hashcat the matching password is AjKXT7. I will try this on an actual device before christmas.
$1$.s9Ja..s$gM4OdlyS9ky05TfsA3qeL0
$1$T5f7njVX$itbwBbH5SnomehGVWTQ5y/