The installation takes 5–15 minutes. You will see a progress bar and lines of code.
Since these are generic "Chinese Head Units," official manufacturer sites rarely exist. Your best resources for the latest verified files are: XDA Developers Forum: Search for "K2001N Android Head Unit." 4PDA (Russian Forum): k2001n firmware update upd full
Because manufacturers rarely push over-the-air (OTA) updates, users must manually download and install files. The installation takes 5–15 minutes
Unlike Samsung or Google, there is no central repository for these files. Here are the safest sources: k2001n firmware update upd full