Bricked LINKSYS MX5300

Installing and Using OpenWrt
1

Hello OpenWrt community,

I have a Linksys MX5300 (IPQ8074) running OpenWrt 24.10.1 that has its ART partition (mtd17, 0:art) accidentally erased during a recovery attempt. As a result, all ethernet ports (lan1-lan4, WAN) and WiFi show no carrier and "Coldboot Calibration timed out".

Router details:

  • Model: Linksys MX5300
  • Hardware: IPQ8074 (Qualcomm IPQ807x)
  • WiFi chip: QCA9984
  • Base MAC: 00:03:7f:ba:db:ad
  • OpenWrt version: 24.10.1, r28597-0425664679
  • U-Boot: 2016.01

What I have:

  • Serial console access via UART (working)
  • U-Boot access (working)
  • OpenWrt boots successfully
  • Original Linksys firmware: FW_MX5300_1.1.12.210066_prod.img

What I need: An ART dump (0:art, 512KB) from another MX5300 router, or guidance on how to extract it correctly from the original Linksys firmware image.

I have tried extracting from the Linksys firmware but the image is UBI formatted and I cannot locate the correct ART data inside it.

Any help would be greatly appreciated!

Thank you

2

ART is device specific and generated during factory calibration for your specific device, unless you have a backup from your own device, it can't be recovered.