Interestingly I found this in MRPI logs
Quote:
**** **** **** ****
[2019-03-01 @ 00:53:59 +0000] :: [MRPI r16914] - Beginning the processing of package 'Update_jailbreak_bridge_1.16.N_install.bin' (jailbreak bridge 1.16.N I) . . .
Failed to parse package 'Update_jailbreak_bridge_1.16.N_install.bin' (jailbreak bridge 1.16.N I) [return code: 126], skipping . . . 
KindleTool output:
env: can't execute '/mnt/us/extensions/MRInstaller/bin/PW2/kindletool': Permission denied
**** **** **** ****
[2019-03-01 @ 01:09:47 +0000] :: [MRPI r16914] - Beginning the processing of package 'Update_KUALBooklet_f54e864_install.bin' (KUALBooklet f54e864 I) . . .
Failed to parse package 'Update_KUALBooklet_f54e864_install.bin' (KUALBooklet f54e864 I) [return code: 126], skipping . . .
KindleTool output:
env: can't execute '/mnt/us/extensions/MRInstaller/bin/PW2/kindletool': Permission denied
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