In Galaxy S7, cannot disable Samsung Reactivation Lock

# Summary I'm trying to install a custom build of LineageOS following the instructions [here](https://wiki.lineageos.org/devices/herolte/install#installing-a-custom-recovery-using-heimdall) . I was attempting to load a recovery image using Heimdall when I'm told 'Recovery Check failed'. It turns out Samsung has something called [Reactivation Lock](https://www.samsung.com/us/support/answer/ANS00040928/) , but the settings to disable it aren't present on my phone. I actually called them and they said it had been replaced by Google's Android Device Manager, but there's clearly *something* preventing me from loading a recovery image. I can't link to it because of reputation limits, but the recovery image I was using I built from source; it's linked on the homepage of LineageOS. I did also try it with the images built by Team Win Recovery Project with no luck. I appreciate any help you can give me. # Steps I rebooted into 'download mode' using $ adb reboot-bootloader. Heimdall recognizes the device:

$ heimdall detect
Device detected

but when I try to load the recovery image I get an error:

$ heimdall flash --no-reboot --RECOVERY out/dist/recovery.img
Uploading RECOVERY
100%
RECOVERY upload successful
Ending session...
ERROR: Failed to receive session end confirmation!
Releasing device interface...

and on my Android, it shows SECURE CHECK FAIL : recovery in the top-left corner (in red, if that matters). Rebooting into recovery mode just reboots the phone normally. # Specs - Model: heroltevzw - Model number: SM-G930V - Android version: 7.0 - Patch level: August 1, 2017