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The suitable replacement part is S34ML04G2. It is compatible with F59L4G81A-25TIG in respect of Block and page size architecture.
Note that the spare area for S34ML04G2 (x8, 4 Gb) is 128 bytes instead of 64 bytes.
Please carefully review the S34ML04G2 datasheet from link below for any differences within the command sequence.
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