I just bought this China made tablet(Micro digit M7502). Jelly bean 4.2.2 is installed on it. But I want to upgrade it in to 4.3. Do any one know here? I think this is the right place to ask. Thank you.
Unfortunately, the manufacturer has not provided any OTA updates for your device.
Any chance of getting Android 4.3 would be by rooting it and installing a custom ROM.
After some searching, I found that there are no custom ROMs for your device. So you can proceed by submitting a request to the developers at XDA to build one specifically for your device. Remember that flashing a ROM not meant for your device can result in bricking.