Yes, My experience says, the P3S nearly unbrickable Also... :) The only way is a F/W shutdown.... It must be just at the right time :( And still I have fixed it... But Of course!! Pm me :)
One more thing... If 1.7.94 does fix it?? It will come back with any other downgrades... I assume... That is what happens to 1.7.9 in the same situation ... FYI I have had no better range than with 1.7.9 But I am Boosted...
I never managed to get 1.5.7 sensor error fixed :( It doesn't seem to have a F/W to correct the issue... What I found to work with 1.7.9 does not work on 1.5.7 :( I have looked for lesser known 1.5.7X F/W ... But I can find nothing but what you already know :) Yes... The 1.7.94 is 856kb...
Basically, it means that your drone has multiple versions of F/W in it.. Debug will clean it up ;) But It is not always necessary... Remember you have to "update" each battery.. or it will have that + every time you use it..
My P3Pkiller Setup....
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JHpower 18.5V...