View source for SDK: new flash support instructions

[[RUT230_Product_Change_Notifications#2019.06.19:_device_flash_memory_change|RUT230]], [[RUT240_Product_Change_Notifications#2019.06.19:_device_flash_memory_change|RUT240]], [[RUT850_Product_Change_Notifications#2019.06.19:_device_flash_memory_change|RUT850]], [[RUT900_Product_Change_Notifications#2019.06.19:_device_flash_memory_change|RUT900]], [[RUT950_Product_Change_Notifications#2019.06.19:_device_flash_memory_change|RUT950]] and [[RUT955_Product_Change_Notifications#2019.06.19:_device_flash_memory_change|RUT955]] devices will be manufactured with a new type of flash memory starting from the second half of 2019 (click on one of the previous links for more details). Firmwares compiled on RUT2XX_R_00.01.07, RUT850_R_00.01.03.2, RUT9XX_R_00.06.02 and older SDK versions will not work with these devices, because they lack the new flash support.

To solve this issue, move the [[Media:473-mtd-m25p80-add-support-for-XTX-flash-and-undefined-flash.patch|473-mtd-m25p80-add-support-for-XTX-flash-and-undefined-flash.patch]] file to the target <i>/target/linux/ar71xx/patches-3.18/</i> directory and re-compile the firmware.