Originally Posted by fenstre
IF this is possible, it's very dangerous because it bypasses the normal checks that the bootloader does before installing a recovery (and obviously would require S-Off). But the way a flashable .zip works is that it has files, and a script that installs the files. You could (probably) write a script that checks the phone model, then writes an image file to the partition where HBOOT lives. Why do you want to do this?
The only reason I wanted to try this, is because I flashed HBOOT 1.44 to my phone, and ADB and FASTBOOT does not work with that HBOOT and Windows 8.1 combined, and all the computers in my house are on Windows 8.1. However, I used a live Linux USB and flashed back 1.56 HBOOT, so all is good now.