@homeceo43:
Yeah, that's the one

.
I don't remember the exact error the b0rked 4G PW2 releases threw, but this seems to be in the same vein...
Code:
160708:080608 cvm[5176]: E BookletImplementation:CreateError:name=com.lab126.booklet.kindlet:Booklet Load Failed
160708:080608 cvm[5176]: java.lang.IllegalStateException: Unknown device capability path
160708:080608 cvm[5176]: at com.amazon.kindle.kindlet.internal.portability.capability.f.<init>(nlf:96)
160708:080608 cvm[5176]: at com.amazon.kindle.kindlet.internal.portability.L.aP(ajf:216)
160708:080608 cvm[5176]: at com.amazon.kindle.kindlet.internal.KindletBooklet.create(zw:1745)
160708:080608 cvm[5176]: at com.amazon.kindle.restricted.booklet.impl.Z.znB(vme:1672)
160708:080608 cvm[5176]: at com.amazon.kindle.restricted.booklet.impl.G.run(vme:736)
160708:080608 cvm[5176]: at java.lang.Thread.startup(Unknown Source)
160708:080608 cvm[5176]: W BookletImplementation:LifecycleError:phase=load,code=0x2:
No idea if a newer FW might help or not.