Update KoboUSBMS to v1.2.1
Update KoboUSBMS to v1.2.1

NiLuJe/koreader-base,NiLuJe/koreader-base,koreader/koreader-base,koreader/koreader-base,Frenzie/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base,Frenzie/koreader-base,koreader/koreader-base,koreader/koreader-base,Frenzie/koreader-base,NiLuJe/koreader-base