Using Heimdall on mac to unroot, update...

i only have a mac now and i was told to use Heimdall to do STUFF. I am on Lollipop, rooted, and would like to unroot, and update to Marshmallow... Do i use the necessary files from here, and use in Heimdall as if it was just like odin.. i mean will it read the files like it was a pc... Thanks in advance...

P7500 TWRP 2.8.7.0 entering recovery, black screen (Heimdall Linux)

yeah what stupid thing am i doing please?

twrp2870-20150814-p4.zip
Tab 10.1 p7500 3g stock 4.0.4
Heimdall 1.4.0
Ubuntu 14.04
seems to flash fine (blue progress bar ok)
hangs when selecting recovery (VOL-+POWER, select left side icon, VOL+).
is there some way to get into recovery from Heimdall btw? adb doesn’t work in download mode afaik.

Quote:

*****.********:~/Downloads/TWRP/recovery$ sudo heimdall flash --SOS recovery.img --no-reboot [sudo] password for ******: Heimdall v1.4.0 Copyright (c) 2010-2013, Benjamin Dobell, Glass Echidna http://www.glassechidna.com.au/ This software is provided free of charge. Copying and redistribution is encouraged. If you appreciate this software and you would like to support future development please consider donating: http://www.glassechidna.com.au/donate/ Initialising connection... Detecting device... Claiming interface... Setting up interface... Initialising protocol... Protocol initialisation successful. Beginning session... Some devices may take up to 2 minutes to respond. Please be patient! Session begun. Downloading device's PIT file... PIT file download successful. Uploading SOS 100% SOS upload successful Ending session... Releasing device interface...