@surdu_petru
Maybe a software called "Dc phoenix" can help you unbrick your device. My BTV-W09 has also been bricked by flashing the wrong firmware. Even though I send it to Huawei's official service center, it cannot be repair by flashing, and the only way they said was to change a new motherboard. However, I found this software, and surprisingly, it works. This is a paid software, but i think this information will be useful to you.
Maybe a software called "Dc phoenix" can help you unbrick your device. My BTV-W09 has also been bricked by flashing the wrong firmware. Even though I send it to Huawei's official service center, it cannot be repair by flashing, and the only way they said was to change a new motherboard. However, I found this software, and surprisingly, it works. This is a paid software, but i think this information will be useful to you.