hourglass 1.35 is always appearing when launching luma chainloaderBefore you update the 3DS firmware in System Settings, make sure your custom firmware is on the latest Luma3DS v9.1, GodMode9 v1.7.1, and boot9strap v1.3 on both the SD card and CTRNAND.
or for a combined guide of the above two:
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it goes hourglass 1.35 again and againYou should put godmode9 to the luma/payload folder.