Firstly try to use Garmin webupdater.
Follow easy menu selection and check Thai text and Thai voice.
check box for "all asian text" or something like that
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if you have thai characters but not the keyboard, try this:
Add these two lines into \Garmin\Text\Thai.gtt in <hdr> section:
<upperkbrd>ฆฉซญฎฏฌฐฑฒณธผ็ฝึภืศูษ์ฬ๋ฮ๊โฤำๆ.()</upperkbrd>
<lowerkbrd>กขคงจชดตถทนบปพฟมยร่ล้วุสิหีอัะาเแไใ</lowerkbrd>
And change keyboard style in system setting from QWERTY to ABCDE
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If your device doesnt has this possibility and cant display thai characters
(tools>settings>language)
you should flash it-
Flashing refers to changing of a firmware of a non-localised unit to a localised one. A word of caution if you want to flash a non-localised unit to a localised one. There are certain risk involved when flashing a unit. Doing it wrongly can result in your device becoming a useless paperweight. Besides, it will also void your warranty. Sometimes even when an unit has been successfully flashed, its performance can be erratic and causing errors during navigation-
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