Скачать или смотреть 2 ways to program keys on a Mazda 2 DE and erase old ones

What I missed saying is programming new remotes erases old ones, so bring them with you for re-learning.
Before you ask - yes, the 3rd button (open trunk) works! Press and hold and it opens the trunk ;) If your car is locked, it doesn't unlock it, just the trunk. If your aftermarket alarm system is smart enough, it is going to allow trunk opening by the remote, but (probably) only by some amount of time after locking the car.

Key w/o trunk button: https://www.aliexpress.com/item/32833...
Key w/ trunk button: https://www.aliexpress.com/item/32835...

00:00 Intro
00:52 The two types of remotes
01:43 Programming the remote controls
03:08 Opening the key shell
04:17 Placing the transponder
05:06 Programming keys documentation
06:08 Method 1: Forscan. Use when you have only 1 (or no) valid key
11:15 Erasing existing keys (again using Forscan)
15:51 Testing NOT programmed key
16:28 Method 2: No PC required. Use when you have at least 2 valid keys