Download Android 4.2.2 Jelly Bean stock firmware for Vigica C70A TV Box from here.
Archive: 2014.12.29_C70_Gneric_ATSC_Update Firmware.rar & C70A_ATSC_20141013.V0801.zip
Model: Vigica C70A TV Box
Model number: g18ref
Image: C70A_ATSC_20141013.V0801.zip / g18ref-ota-20141229.V0801.zip
Image file size: 310 MB
Platform: Amlogic AML8726-MX
Build number: g18ref-user 4.2.2 JDQ39 20141013.V0801 test-keys / g18ref-user 4.2.2 JDQ39 20141229.V0801 test-keys
FW version: Android Jelly Bean 4.2.2
How to upgrade for your android TV box
Step 1: Select the FAT32 mode and Format the TF card.
Step 2: Copy the files (1>aml_autoscript 2>factory_update_param.aml 3>xxxx.zip 4>recovery.img 5>u-boot.bin 6>unlock_autoscript) to TF Card.
Step 3: Unplug the power, Insert the TF card to TVBOX’s TF card reader.
Step 4: Plug in the power, Wait 20 seconds will start to update.
Step 5: When the TV BOX reboot, Please remove the TF Card (This step is very important!), And continue to waiting five minutes.
Step 6: The update will completed, Enjoy!
If the firmware update, your installation and storage files will lost, please backup your files before update!
Caution: Please do not update firmware unless you know what you are doing, you really want it or it is absolutely necessary. Firmware updates may occasionally have bad results, like bricking your device, temporarily or permanently. The firmware update process is done entirely at your own risk. Before attempting to update the firmware, back up your data. BTW, a link doesn’t last forever.