:: Check for Devices
adb devices
:: -r >> reinstalls without removing the data
:: -s >> installs in SD Card
:: to install all APKs in folder D:/APK Backup/.
for %f in ("D:/APK Backup/*.apk") do adb install -r -s "%f"
:: to install all APKs in current folder
for %f in ("*.apk") do adb install -r -s "%f"
pause
exit