I have a MT6000 router that is bricked. I am connected to the router with ttl. I am now in the u-boot menu. I can upload files with tftp by selecting 0 and starting tftpsrv. What are the next steps?
Seems like you installed plain OpenWrt instead of GL firmware?
Here is the official debrick manual: Debrick via Uboot - GL.iNet Router Docs 4
Uploaded openwrt-23.05.5-mediatek-filogic-glinet_gl-mt6000-bl31-uboot.fip u-boot image, the device is now bricked. I have connected to the router with ttl. I access to the u-boot menu. I can upload files with tftp by selecting 0 and starting tftpsrv. I have uploaded the firmware successfully to the device. What are the next steps to bring up the firmware?
Since you installed plain OpenWrt you need to follow the tutorials for OpenWrt itself: [OpenWrt Wiki] Installing OpenWrt via TFTP
You may have destroyed the factory partitions - in that case you might get never back to GL firmware. Not sure about that.
I have access to the u-boot menu. I successfully upload the files to the device. I don't know the next steps to save the operating system.
What "files"? You only need the firmware for your device and then reboot.
You can download the firmware here: GL.iNet download center
After reboot nothing happens and the led still doesn't light up. admon,
Do you have any information about ttl and u-boot?
What does 'ttl' mean in your context?
Could you provide a screenshot of your uboot screen?
The next step is to flash official GL firmware and let the router do the rest. This will bring the router back online with GL GUI.
Did you ever figured it out? I'm in the exact situation right now.