How to force load desktop version of website (changing user-agent doesn't work)?

Some webpages **forces mobile version even I change user-agent**. I changed user-agent in built-in browser and "Dolphin Browser HD", I am checking it on page www.user-agent-string.info Main problem is engadget.com, always in mobile version. I tried to clean cookies, restart browsers etc. This is my results: 1. in built-in browser, user-agent - "desktop" - (allegro.pl ) **doesn't work**, redirects to mobile version 2. in "Dolphin Browser HD", user-agent - "desktop" - (NSFW: redtube.com) **doesn't work**, redirects to mobile version - (allegro.pl) works fine 3. in "Dolphin Browser HD", user-agent - "IPad" - (engadget.com ) **doesn't work**, redirects to mobile version - (allegro.pl) works fine - (NSFW: redtube.com) works fine 4. in "Dolphin Browser HD", user-agent - "custom": *Mozilla/5.0 (Windows NT 6.0; rv:7.0.1) Gecko/20100101 Firefox/7.0.1* - (engadget.com]) **doesn't work**, redirects to mobile version - (NSFW: redtube.com) **doesn't work**, redirects to mobile version - (allegro.pl) works fine Maybe this pages using "adobe flash" user-agent detection ? (I'am using Asus Transformer TF101, Android 3.2.1, Adobe Flash Player 11)