If you already have fastboot you can skip this
You need to get fast boot first by using the
Unbrick Guide or manually zeroing out a partition to enter fastboot
To do it manually use terminal and do
$ su (grant superuser permission)
# dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/(use laf or recovery)
Boot into fastboot depend on what partition you zeroed out (if on laf power off the phone and plug in to usb and hold vol+, if on recovery in terminal do
$ su
# reboot recovery)
Then to reflash the laf (assuming you want download mode
here's my backed up laf) and cwm (I don't know you model of the l70 so here a
universal cwm for the l70)
Then with fastboot flash (laf or recovery nameoffile.img (has to be in the same folder as fastboot) and you're done.