I too sent the dreaded AT+IPR=9600 command and voila, I had a postage stamp sized paper weight. After a couple hours of searching I came across this (http://catcatcat.d-lan.dp.ua/wifi-esp8266-esp-202-esp-12f/) page in Russian (use google translate) which is a tutorial for flashing the ESP 8266 (to SDK 1.5.4), with one small difference from most other tutorials, a call to put the blank.bin to address 0x7E000. I gave it a whirl and nothing seemed to change, until I re-flashed once more like normal and boom, the ESP was back in business.
Totally wrong about this?
I am willing to accept any of these, but it somehow worked for me.
Good luck to the next newb who sends that IPR command!
Below is paraphrased from the referenced page:
Optional file vnem are placed by default RF settings
Initialize the field of flash memory user settings
Initialize the flash memory area of the system parameters
\ Bin \ at \ 512 + 512