You said you have rom manager. I haven't used rom manager for a while, but it used to have a "reboot into recovery" option. You could try that. I'm not super familiar with the Hauwei Ascend. Mainly HTC, Samsung & LG devices for me.

Try that option, if that still doesn't work, try goo manager: https://play.google.com/store/apps/detai...wsMSwyLDNd

That'll download & flash, like rom manager will, a recovery for your device.