problem with recovery & ROM

Dear all,

I ll try to explain my problem :
I have a wiko rainbow

I installed a recovery from android 4.2 to change my ROM
unfortunately, it doesent work correctly ..... now I just have access to my recovery

I d like to change this recovery (to try to install again the ROM from this new recovery)
my problem is : I know how to install a *.zip (ROM format file) from my current recovery, but what I d like is to install/flash a new recovery, so a *.img file

So, is it possible to install/flash this *.img (and so change my recovery) and how can I do that ?


Thanks in advance for your answer, proposition of test (I can nomore use my phone :( )