Don't waste time with the XR, just get a new one...
And to answer your question, I believe nobody in SG has the expertise unlike in China to "upgrade" the storage reliably.
Just go get an iphone 17 Telco set from mister mobile trade in your XR and offset with some CDC and sg60 vouchers.. can even use instalment plans albeit with some chargers.. can last u for another 7 years maybe..
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