Dear customer Creality Ender 3 S1 Pro Shipping time:24-48 hours, in full stock. Defective product support/return policy: https://www.geekbuying.com/help/customer_service/return_policy Tech support if needed - please contact https://www.geekbuying.com/help/about/address/ Best regards

SOLUTION: If your S1 has the STM32F401RCT6 chip that is shipping with a lot of the S1''s then you can easily brick your machine during an update. Download the latest (experimental) firmware for STM32F4 here: https://github.com/mriscoc/Ender3V2S1/issues/128 Put the STM32F4_UPDATE folder in the root of your SD card. Follow the directions here for more specific info: https://github.com/mriscoc/Ender3V2S1/wiki/How-to-install-the-firmware#manual-installation-for-ender3-s1-with-the-stm32f4-soc