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See the document checklist below. If you have all the documents it is not that complicated.
Upon arrival, use 90 day Non-O to open bank account and deposit 400,000 baht. The amount need to be freeze for at least 2 months prior to your visa extension. That's the fastest way. Otherwise you might have to do 60-day family visit extension first to wait for bank account to reach 2 month, then only you can go for 1-year.
Good luck.
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