Default TWRP 2.7 crashed after wipe and cant start TWRP again

I need help. I have B510 and installed TWRP 2.7. I wiped to install omni rom. But after wipe TWRP crashed and dont start again. Now i cant go back to B510.
Smartphones:
LG Optimus 2X(Speed) / Nvidia Tegra 2 1.0GHz / 8GB / 512MB RAM / Android 4.0.4
Huawei Ascend P6 / Hi-Silicon K3V2 1.5GHz / 8GB / 2GB RAM / Android 4.4.4

Tablets:
Samsung Galaxy Note 10.1 (2012) / Exynos 4 Quad (Exynos 4412) 1.4GHz / 2GB RAM / Android 4.1.2