Warning Accountant Name Raspbian Kernel 3.12.25+

NO ACCOUNTING (DIRECT) adapter is not accountable to the latest version of Kernel 3.12.25+ Raspbian (on a Raspberry Pi Model B +), it indicates that the rt2870.bin driver is not compatible (error Firmware launch).

Here is the error:

Error - Failed firmware file 'rt2870.bin'
Information - to request Loading Firmware

Here is the solution:

Add the following repository to your /etc/apt/sources.list

deb [...]

(I recommend leffacer after finishing the solution)

Then type the following commands:
aptitude update
or
apt-get update

aptitude install firmware-ralink
or
apt-get install firmware-ralink

Made "Yes" or "Yes" when asked to confirm the installation.

configure your interfaces file

/ Etc / network / interfaces

then reboot:

reboot

Well, good luck.