I have successfully built an encrypted bootable usb according to the instructions https://www.openbsd.org/faq/faq14.html#softraidFDE
After booting successfully several times, the device went to ddb after I installed chrome without previously adding xfonts during the install. Subsuequent attempts to boot were unsuccessfull. I have erased partitions by disklabel and fdisk and tried to repeat the installation process. However, the encrypted raid device appeared and I was able to unlock it by the same passphrase, so I ceased the installation. Is it possible to delete the crypto raid properly at this stage? Should I tri to rebuild it? Any advice is appreciated. Thanks in advance.