iPad Air 2 iOS 14.4.2 error while running checkra1n

[c-hri-s]

iPad Air 2 Wi-fi freshly restored to 14.4.2 (iPad_64bit_TouchID_14.4.2_18D70_Restore.ipsw) iOS 14.4.2 checkra1n 0.12.2 (tested with others too) Ubuntu 20 USB-A direct to PC, tested multiple cables official and clone

Safemode makes no difference

Log as follows:

root@ubuntu:~# ./checkra1n -c -v
#
# Checkra1n beta 0.12.2
#
# Proudly written in nano
# (c) 2019-2020 Kim Jong Cracks
#
#========  Made by  =======
# argp, axi0mx, danyl931, jaywalker, kirb, littlelailo, nitoTV
# never_released, nullpixel, pimskeks, qwertyoruiop, sbingner, siguza
#======== Thanks to =======
# haifisch, jndok, jonseals, xerub, lilstevie, psychotea, sferrini
# Cellebrite (ih8sn0w, cjori, ronyrus et al.)
#==========================

 - [04/18/21 20:19:53] <Info>: Waiting for DFU devices
 - [04/18/21 20:19:53] <Verbose>: Using usbmuxd
 - [04/18/21 20:19:56] <Warning>: connection refused?!
 - [04/18/21 20:19:56] <Error>: usbmux: Failed to connect (error code: -79)
 - [04/18/21 20:20:12] <Verbose>: DFU device connected: 15706118eb0826
 - [04/18/21 20:20:12] <Info>: Exploiting
 - [04/18/21 20:20:12] <Verbose>: Attempting to perform checkm8 on 7001 1...
 - [04/18/21 20:20:12] <Info>: Checking if device is ready
 - [04/18/21 20:20:12] <Verbose>: == Checkm8 Preparation stage ==
 - [04/18/21 20:20:12] <Info>: Setting up the exploit (this is the heap spray)
 - [04/18/21 20:20:12] <Verbose>: == Checkm8 Setup stage ==
 - [04/18/21 20:20:12] <Verbose>: Disabled probabilistic mode since we encountered a partial xfer
 - [04/18/21 20:20:12] <Verbose>: Deterministic approach was successful!
 - [04/18/21 20:20:12] <Info>: Right before trigger (this is the real bug setup)
 - [04/18/21 20:20:12] <Verbose>: Entered initial checkm8 state after 0 steps, issuing DFU abort..
 - [04/18/21 20:20:12] <Verbose>: DFU device connected: 15706118eb0826
 - [04/18/21 20:20:12] <Verbose>: == Checkm8 Trigger stage ==
 - [04/18/21 20:20:12] <Verbose>: Checkmate!
 - [04/18/21 20:20:13] <Verbose>: DFU device connected: 15706118eb0826
 - [04/18/21 20:20:13] <Verbose>: == Checkm8 Trying to run payload... ==
 - [04/18/21 20:20:14] <Verbose>: If everything went correctly, you should now have code execution.
 - [04/18/21 20:20:14] <Info>: Entered download mode
 - [04/18/21 20:20:14] <Verbose>: Download mode device found
 - [04/18/21 20:20:14] <Info>: Booting...
 - [04/18/21 20:20:14] <Verbose>: Setting bootargs to: rootdev=md0
 - [04/18/21 20:20:16] <Error>: Failed to get device serial-number: (No such file or directory) (error code: -66)
 - [04/18/21 20:20:16] <Error>: Failed to parse USB serial number (error code: -5)

[lopsandrea]

The same since early January