[ABM Prottoy]

Today I got a popup window saying new update is available to download. I was so excited. Don't know why my phone is addressing the update as a critical update. Whatever the reason is, I don't know. But now, I want to know that how much data I need to update from cyan to denim? Because I have a limited data plan it's very necessary to know this before I start the update.
Anyone know that please help me. Thanks in advance :)

[Harrie-S]

It's reported out India that it is 250 mb. So you need WiFi because there is a max of 100 mb on cellular data downloads.
And yes "firmware" updates are tagged as critical by Microsoft.

[ABM Prottoy]

Will it be different from country to country? I live in Bangladesh. By the way, thanks for your reply. :)

[Harrie-S]

This was for the 520. The 525 has a about the same spec. So should be about the same size. But I do not know it for sure.

[ABM Prottoy]

Thanks. Downloaded the update today. It was about 463.30 MB.

[Harrie-S]

Much more than expected I hope it did not cause you problems.