fix for you.
A Quick Fix for Cache not enough, please insert external SD card to download
- To solve this issues with cache, you need a microSD card. As a good 2 GB capacity SD card will do just fine.
- Once you got your Sd card, insert the SD card / memory card into the Infinix Note 3, you are presented with the option to use it as internal memory or portable storage.
- Select portable storage.
- Now, go run the software update again and it should download without popping up that error message any more.
Also, If you seen this error message on other smartphones other than the Infinix Note 3, the quick fix above should work too. Do give it a try.