Unless you break the bootloader, it is possible to flash using fastboot tool, which is common for Android flashing.

Otherwise, it can be a bit tricky a first, but you can reflash it either with QDLoader (official Qualcomm tool, but troublesome as it requires Windows) or with https://www.96boards.org/documentati...es/qdl.md.html on Linux (may not work in every possible case, but should be fine normally).