He probably didn't answer because it has been asked and answered so often. No, you can only go back to one prior to the highest you have previously installed. Example is if you have been as high as 1.5, you can only go back to 1.4, but if 1.4 has been your highest you can go back to 1.3.
Such a hack is the dream of several on here who would love nothing more than to go back to prior versions. One member here has asked for someone to PLEASE leak out or write and post such a hack after they tried and failed with the hacks that did exist in the past with older FW.
I can only generalize based on the many related threads until those who are having the issues reply with their specific scenarios. From what I recall, many went to 1.4 to get the new intelligent flight mode features. Once on 1.4, some users experienced the widely reported "no video" issue. Some went back to 1.3, while others waited for 1.5 in hopes it would be corrected for them. Once 1.5 was released, it didn't always fix the no video issue and also introduced issues like vibrations, etc. Now they were stuck with only a clear path back to 1.4 and no longer able to go back to 1.3 which they have said was the last very stable version, though many with issues have stated they just want 1.19 back.
