The Stable update V6.4.6.0.KHLCNCB has been officially released for Redmi 2A (codename is lte26007). Before updating, please make sure you have downloaded the exact ROM matching your Xiaomi phone/tablet. In Fastboot mode, you can check model code by typing fastboot getvar product in cmd/shell.
The firmware files posted here are all official Xiaomi MIUI or HyperOS ROM, xiaomiROM.com do not own and never modified those firmwares，you will always download the file from Xiaomi server.
You may interest in those contents: Redmi 2A ROM Topics Xiaomi Devices Index
Download Redmi 2a (lte26007) China MIUI 6 V6.4.6.0.KHLCNCB Recovery ROM with Android 4.4. Firmware size is 347.4 MB.