I returned this unit and bought ts-473a instead. I didn’t opened it so i can’t tell for sure. People say that the soldered ones were released during COVID and most probably those new units have the normal slots.

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My device claimed that the 8GB was not expandable. After receiving it, however, I realised that there was a free slot. So I ordered an additional 8GB module and installed it. Now I have 16GB without any problems. 8GB is rather tight.