Can not connect to AX3000T after upgrade

I am using the Xiaomi AX3000T (RD03, early version) with OpenWRT for several months and it all worked just fine.
Until I had the great idea to upgrade to the latest version.

I downloaded: https://downloads.openwrt.org/snapshots/targets/mediatek/filogic/openwrt-mediatek-filogic-xiaomi_mi-router-ax3000t-squashfs-sysupgrade.bin
I went to http://192.168.1.1/cgi-bin/luci/admin/system/flash and uploaded the firmware. Device rebooted and I am getting a blue light.
After that I am unable to reconnect to the device. In my main router I can see the AX3000T receives and IP address and is able to ping it. It is stated as: OpenWrt.localdomain.
On my pc I can see the macaddress and IP through the commandprompt using "arp-a". But I am unable to ping it.

Can someone help me getting back into the device?

snapshot means no webUI, tried SSH ?

https://openwrt.org/releases/snapshot

Yeah, tried to connect, but it was a no go.

is your router running as router, AP, or something else ?
did you reset the settings during upgrade ?

I had set it up as an AP.
Before upgrading I downloaded the config and checked the box to keep the settings.

I have already reset the device by holding the reset button and plugged in the powerplug, but the light turns blue and the device is up and running, but without wifi channels and the ability to connect to the device.

wifi off is fine post reset, it's disabled by default, you'll need an ethernet cable.
it also means it doesn't appear to be bricked, since reset worked.

how is the device connected to the upstream router ?

https://openwrt.org/docs/guide-user/troubleshooting/failsafe_and_factory_reset

Ah, a reset gave me the option to ping the device and the mainrouter (wired connection) sees the device as OpenWrt instead of OpenWrt.localdomain, with same IP address.

Tried SSH, but the connection is refused.

try to answer the question in my last post ...

Well, I disconnected the router from my mainrouter and connected to the AX3000T directly. Then I got an IP, went to 192.168.1.1 through putty and logged in as root, finally getting into the router! Tnx!

What is wise to do next? upgrading the firmware to the latest through the console?

grab the latest stable release from https://firmware-selector.openwrt.org/, reset again.

https://openwrt.org/docs/guide-user/installation/sysupgrade.cli

Tried to download using
wget https://downloads.openwrt.org/releases/23.05.4/targets/mediatek/filogic/openwrt-23.05.4-mediatek-filogic-xiaomi_mi-router-ax3000t-squashfs-sysupgrade.bin

But then I am getting "Failed to send request: Operation not permitted"

Tried to connect to the device using Winscp, but am not able to connect either. am I missing something after I have reset the device?

with the default config, this will only work if you use the WAN port to connect to the upstream router.

hard to know without an error message, but I'm guessing you're hitting the scp error described in the 2nd troubleshooting section of the sysupgrade.cli link, it applies to winscp too.

Sorry, my bad! When there is no internet, the device can't download.... :rofl:

Anyway, Thank you for your help! I flashed the device and just logged in via GUI, uploaded my last save backup and the router has just rebooted.