The XDA Developers forum has a dedicated section for MediaTek devices, including the MTK 8227L. You can find firmware links, as well as discussions and guides related to the chipset:
Q: How do I flash MTK 8227L firmware? A: You need to use SP Flash Tool, MTK USB driver, and a computer to flash the firmware. mtk 8227l firmware link
– Includes a firmware link in the description specifically for 2GB RAM models. 8227L Bluetooth & Radio Repair Update – A common fix for connectivity issues. 4. How to Flash (The "Solid" Method) Format a USB Drive: (usually 32GB or smaller works best). Copy Files: Place the firmware files (usually 8227L-xxx.zip or a collection of files) directly in the of the USB drive—do not put them in a folder. Initiate Update: Plug the USB into the head unit's 4-pin or 6-pin USB port Settings > Car Settings > System Update Settings > Factory (Code 8888 or 1234) > System Update If the unit is bricked, you may need to use the SP Flash Tool on a PC with a male-to-male USB cable. The XDA Developers forum has a dedicated section
The MTK 8227L is a quad-core processor commonly paired with 1GB or 2GB of RAM and 16GB or 32GB of internal storage. – Includes a firmware link in the description