Same serial number on several android devices. Adb is useless. How can I change the serial number?

Question

I bought a lot (500+) cheap China tablet with AllWinner processor and Android 4.0.3. All tablets expose the same serial number. I can't deploy my application simultaneously on several devices (with a USB hub) using ADB.EXE because it can't distinguish them.

I'm thinking about a pre-deploy process that change the internal serial number, is it possible? Where is the serial number stored?

Note: tablets are rooted

Answer 1

You need to populate /sys/class/android_usb/android0/iSerial sysfs file with unique values for every device. Most vendors do it with custom init script, which would read the value from a persistent system property or a regular file and put it in sysfs on every power up.

Answer 2

Try editing /data/misc/wifi/serialno then reboot, it worked as a permanent solution for me

The location of this number may differ between android versions

The serial number should be stored in a file with only the serial number inside and no \n

Answer 3

build number etc by editing the 'build.prop' file in /system. The serial number can be changed by adding the property 'ro.serialno=' to build.prop file