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* Follow setup.md, but instead build android recovery image: `pmbootstrap install --android-recovery-zip` and then `pmbootstrap export`
* Download TWRP for a5y17lte - https://eu.dl.twrp.me/a5y17lte/twrp-3.7.0_9-0-a5y17lte.img.html
* Get heimdall from Lineage (https://wiki.lineageos.org/devices/a5y17lte/install/#preparing-for-installation)
* Follow Lineage guide, I found that the new heimdall only worked when i reversed the usb-c cable, I was then able to reboot into Download mode and test it worked with `heimdall print-pit`
* Go back into Download mode with Volume Down + Home + Power
* `heimdall flash --RECOVERY twrp-3.7.0_9-0-a5y17lte.img --no-reboot`
* Manually reboot with Volume Down + Power button
* As soon as it turns off then boot up with Volume Up + Home + Power
* As soon as you see the TWRP icon can release the buttons
* Once TWRP booted Swipe To Allow Modifications
* You can now use `adb shell` to get access to the device
* Run `twrp sideload` on the shell
* The shell will exit and you can then side load the recovery zip `adb sideload pmos-samsung-a5y17lte.zip`
* This will send the zip across and install it
* `adb reboot`
* As postmarketos boots you'll see it display the splash screen and also it should automatically setup usbnet and you'll then be able to ssh in.