OpenWrt with SQM to reduce ping?

I'm sorry to hear your initial flash went astray. You'll get the best help from community members with your specific device. I've flashed OpenWrt on many targets, but not this one.

Try starting with a review of the device specific installation thread here.

If that doesn't help, post in that thread, but provide very specific information on exactly which binary you installed, exactly which steps or instructions you followed, etc. Without very specific information, it will be difficult to diagnose.