[IMPORTANT]: During my discussions with a member of the forum, I found he took several attempts to get FW installed on his P3. Later on he has found that his SD card has issues.
OMG, this can happen to anyone and every one if we don't take care.
1. We should never take out SD card when P3 is ON
2. Use only reputed make and from reputed suppliers as there are many fake SD cards are available in the market. They are lower sized but their internal tables are modified so when you look at laptop, it shows as a high capacity. Such cards will corrupt data if you exceed their limits or in short are not reliable and warned not to use.
3. In view of this, I recommend to save original 16GB card that came with P3 reserved for updates ONLY. Don't use that card for any other purposes. That would save to to some extent. FW is the brain of the system and you can easily brick your P3 with corrupted uploads.
4. In case you are doubtful of your upgrade, you can always downgrade and later on upgrade again with the latest FW.
5. It is suggested not to download FW from any other site except DJI, who are responsible for distribution of the correct FW.
Sorry, If I over stepped, I felt to warn every one of you and did so with good intentions. I am concerned to see so many failures during FW installations.