Firmware upgrades fails at 90% all the time. How can I resolve that?

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Mostly this issue solves it self after a few tries but when the firmware upgrades keep on failing you can follow these steps written by eWeLink Telegram group member @mousehunt:

  1. Force kill eWeLink app .
  2. Open eWeLink app.
  3. Directly press the switch u wan to update (do not press anything else).
  4. Update (do not press anything else).
  5. Wait for success.
  6. Repeat step 1 for another switch.

Source: Kovacs (@mousehunt) on eWeLink official Telegram group on June 23rd, 2020

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