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I'm working on a device powered by the LinkIt Smart 7688 at the moment, and having some driver issues with building a new OpenWRT image from scratch for it. One of those issues is that the WiFi driver blobs don't seem to have been updated for some time (~2017?), and won't work with the current kernel.
Has MediaTek stopped supporting the Linkit Smart 7688?
Mediatek provide it's own binary wifi driver in its feeds based on old 15.05 OpenWrt version. It seems not updated since years (https://github.com/MediaTek-Labs/linkit-smart-7688-feed). Hard to know it they still support it or not.
Luckily, some nice people build a new driver, more open called mt76 (https://github.com/openwrt/mt76). It's included in OpenWrt 18.06 (Kernel modules > Wireless Drivers) and it should work better then Mediatek one. Use last version (18.06.4) as it contains improvement of this driver.
