It’s only a matter of time.
When trying to downgrade from current versions of StockROM Oreo 8.x to StockROM Nougat 7.x in order to use /e/ for herolte * dev (nougat) fully functional, many users run into the BOOTLOADER DEVICE # ~ BINARY version # problem. Only an e-0.7-o- / e-0.7-p- can currently see a workaround. Unofficial builds of LineageOS-for-mircoG (15.1 / 16.0) work fine.